/*  Prototype JavaScript framework, version 1.7
*  (c) 2005-2010 Sam Stephenson
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*  For details, see the Prototype web site: http://www.prototypejs.org/
*
*--------------------------------------------------------------------------*/

var Prototype = {

	Version: '1.7',

	Browser: (function () {
		var ua = navigator.userAgent;
		var isOpera = Object.prototype.toString.call(window.opera) == '[object Opera]';
		return {
			IE: !!window.attachEvent && !isOpera,
			Opera: isOpera,
			WebKit: ua.indexOf('AppleWebKit/') > -1,
			Gecko: ua.indexOf('Gecko') > -1 && ua.indexOf('KHTML') === -1,
			MobileSafari: /Apple.*Mobile/.test(ua)
		}
	})(),

	BrowserFeatures: {
		XPath: !!document.evaluate,

		SelectorsAPI: !!document.querySelector,

		ElementExtensions: (function () {
			var constructor = window.Element || window.HTMLElement;
			return !!(constructor && constructor.prototype);
		})(),
		SpecificElementExtensions: (function () {
			if (typeof window.HTMLDivElement !== 'undefined')
				return true;

			var div = document.createElement('div'),
          form = document.createElement('form'),
          isSupported = false;

			if (div['__proto__'] && (div['__proto__'] !== form['__proto__'])) {
				isSupported = true;
			}

			div = form = null;

			return isSupported;
		})()
	},

	ScriptFragment: '<script[^>]*>([\\S\\s]*?)<\/script>',
	JSONFilter: /^\/\*-secure-([\s\S]*)\*\/\s*$/,

	emptyFunction: function () { },

	K: function (x) { return x }
};

if (Prototype.Browser.MobileSafari)
	Prototype.BrowserFeatures.SpecificElementExtensions = false;


var Abstract = {};


var Try = {
	these: function () {
		var returnValue;

		for (var i = 0, length = arguments.length; i < length; i++) {
			var lambda = arguments[i];
			try {
				returnValue = lambda();
				break;
			} catch (e) { }
		}

		return returnValue;
	}
};

/* Based on Alex Arnell's inheritance implementation. */

var Class = (function () {

	var IS_DONTENUM_BUGGY = (function () {
		for (var p in { toString: 1 }) {
			if (p === 'toString') return false;
		}
		return true;
	})();

	function subclass() { };
	function create() {
		var parent = null, properties = $A(arguments);
		if (Object.isFunction(properties[0]))
			parent = properties.shift();

		function klass() {
			this.initialize.apply(this, arguments);
		}

		Object.extend(klass, Class.Methods);
		klass.superclass = parent;
		klass.subclasses = [];

		if (parent) {
			subclass.prototype = parent.prototype;
			klass.prototype = new subclass;
			parent.subclasses.push(klass);
		}

		for (var i = 0, length = properties.length; i < length; i++)
			klass.addMethods(properties[i]);

		if (!klass.prototype.initialize)
			klass.prototype.initialize = Prototype.emptyFunction;

		klass.prototype.constructor = klass;
		return klass;
	}

	function addMethods(source) {
		var ancestor = this.superclass && this.superclass.prototype,
        properties = Object.keys(source);

		if (IS_DONTENUM_BUGGY) {
			if (source.toString != Object.prototype.toString)
				properties.push("toString");
			if (source.valueOf != Object.prototype.valueOf)
				properties.push("valueOf");
		}

		for (var i = 0, length = properties.length; i < length; i++) {
			var property = properties[i], value = source[property];
			if (ancestor && Object.isFunction(value) &&
          value.argumentNames()[0] == "$super") {
				var method = value;
				value = (function (m) {
					return function () { return ancestor[m].apply(this, arguments); };
				})(property).wrap(method);

				value.valueOf = method.valueOf.bind(method);
				value.toString = method.toString.bind(method);
			}
			this.prototype[property] = value;
		}

		return this;
	}

	return {
		create: create,
		Methods: {
			addMethods: addMethods
		}
	};
})();
(function () {

	var _toString = Object.prototype.toString,
      NULL_TYPE = 'Null',
      UNDEFINED_TYPE = 'Undefined',
      BOOLEAN_TYPE = 'Boolean',
      NUMBER_TYPE = 'Number',
      STRING_TYPE = 'String',
      OBJECT_TYPE = 'Object',
      FUNCTION_CLASS = '[object Function]',
      BOOLEAN_CLASS = '[object Boolean]',
      NUMBER_CLASS = '[object Number]',
      STRING_CLASS = '[object String]',
      ARRAY_CLASS = '[object Array]',
      DATE_CLASS = '[object Date]',
      NATIVE_JSON_STRINGIFY_SUPPORT = window.JSON &&
        typeof JSON.stringify === 'function' &&
        JSON.stringify(0) === '0' &&
        typeof JSON.stringify(Prototype.K) === 'undefined';

	function Type(o) {
		switch (o) {
			case null: return NULL_TYPE;
			case (void 0): return UNDEFINED_TYPE;
		}
		var type = typeof o;
		switch (type) {
			case 'boolean': return BOOLEAN_TYPE;
			case 'number': return NUMBER_TYPE;
			case 'string': return STRING_TYPE;
		}
		return OBJECT_TYPE;
	}

	function extend(destination, source) {
		for (var property in source)
			destination[property] = source[property];
		return destination;
	}

	function inspect(object) {
		try {
			if (isUndefined(object)) return 'undefined';
			if (object === null) return 'null';
			return object.inspect ? object.inspect() : String(object);
		} catch (e) {
			if (e instanceof RangeError) return '...';
			throw e;
		}
	}

	function toJSON(value) {
		return Str('', { '': value }, []);
	}

	function Str(key, holder, stack) {
		var value = holder[key],
        type = typeof value;

		if (Type(value) === OBJECT_TYPE && typeof value.toJSON === 'function') {
			value = value.toJSON(key);
		}

		var _class = _toString.call(value);

		switch (_class) {
			case NUMBER_CLASS:
			case BOOLEAN_CLASS:
			case STRING_CLASS:
				value = value.valueOf();
		}

		switch (value) {
			case null: return 'null';
			case true: return 'true';
			case false: return 'false';
		}

		type = typeof value;
		switch (type) {
			case 'string':
				return value.inspect(true);
			case 'number':
				return isFinite(value) ? String(value) : 'null';
			case 'object':

				for (var i = 0, length = stack.length; i < length; i++) {
					if (stack[i] === value) { throw new TypeError(); }
				}
				stack.push(value);

				var partial = [];
				if (_class === ARRAY_CLASS) {
					for (var i = 0, length = value.length; i < length; i++) {
						var str = Str(i, value, stack);
						partial.push(typeof str === 'undefined' ? 'null' : str);
					}
					partial = '[' + partial.join(',') + ']';
				} else {
					var keys = Object.keys(value);
					for (var i = 0, length = keys.length; i < length; i++) {
						var key = keys[i], str = Str(key, value, stack);
						if (typeof str !== "undefined") {
							partial.push(key.inspect(true) + ':' + str);
						}
					}
					partial = '{' + partial.join(',') + '}';
				}
				stack.pop();
				return partial;
		}
	}

	function stringify(object) {
		return JSON.stringify(object);
	}

	function toQueryString(object) {
		return $H(object).toQueryString();
	}

	function toHTML(object) {
		return object && object.toHTML ? object.toHTML() : String.interpret(object);
	}

	function keys(object) {
		if (Type(object) !== OBJECT_TYPE) { throw new TypeError(); }
		var results = [];
		for (var property in object) {
			if (object.hasOwnProperty(property)) {
				results.push(property);
			}
		}
		return results;
	}

	function values(object) {
		var results = [];
		for (var property in object)
			results.push(object[property]);
		return results;
	}

	function clone(object) {
		return extend({}, object);
	}

	function isElement(object) {
		return !!(object && object.nodeType == 1);
	}

	function isArray(object) {
		return _toString.call(object) === ARRAY_CLASS;
	}

	var hasNativeIsArray = (typeof Array.isArray == 'function')
    && Array.isArray([]) && !Array.isArray({});

	if (hasNativeIsArray) {
		isArray = Array.isArray;
	}

	function isHash(object) {
		return object instanceof Hash;
	}

	function isFunction(object) {
		return _toString.call(object) === FUNCTION_CLASS;
	}

	function isString(object) {
		return _toString.call(object) === STRING_CLASS;
	}

	function isNumber(object) {
		return _toString.call(object) === NUMBER_CLASS;
	}

	function isDate(object) {
		return _toString.call(object) === DATE_CLASS;
	}

	function isUndefined(object) {
		return typeof object === "undefined";
	}

	extend(Object, {
		extend: extend,
		inspect: inspect,
		toJSON: NATIVE_JSON_STRINGIFY_SUPPORT ? stringify : toJSON,
		toQueryString: toQueryString,
		toHTML: toHTML,
		keys: Object.keys || keys,
		values: values,
		clone: clone,
		isElement: isElement,
		isArray: isArray,
		isHash: isHash,
		isFunction: isFunction,
		isString: isString,
		isNumber: isNumber,
		isDate: isDate,
		isUndefined: isUndefined
	});
})();
Object.extend(Function.prototype, (function () {
	var slice = Array.prototype.slice;

	function update(array, args) {
		var arrayLength = array.length, length = args.length;
		while (length--) array[arrayLength + length] = args[length];
		return array;
	}

	function merge(array, args) {
		array = slice.call(array, 0);
		return update(array, args);
	}

	function argumentNames() {
		var names = this.toString().match(/^[\s\(]*function[^(]*\(([^)]*)\)/)[1]
      .replace(/\/\/.*?[\r\n]|\/\*(?:.|[\r\n])*?\*\//g, '')
      .replace(/\s+/g, '').split(',');
		return names.length == 1 && !names[0] ? [] : names;
	}

	function bind(context) {
		if (arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
		var __method = this, args = slice.call(arguments, 1);
		return function () {
			var a = merge(args, arguments);
			return __method.apply(context, a);
		}
	}

	function bindAsEventListener(context) {
		var __method = this, args = slice.call(arguments, 1);
		return function (event) {
			var a = update([event || window.event], args);
			return __method.apply(context, a);
		}
	}

	function curry() {
		if (!arguments.length) return this;
		var __method = this, args = slice.call(arguments, 0);
		return function () {
			var a = merge(args, arguments);
			return __method.apply(this, a);
		}
	}

	function delay(timeout) {
		var __method = this, args = slice.call(arguments, 1);
		timeout = timeout * 1000;
		return window.setTimeout(function () {
			return __method.apply(__method, args);
		}, timeout);
	}

	function defer() {
		var args = update([0.01], arguments);
		return this.delay.apply(this, args);
	}

	function wrap(wrapper) {
		var __method = this;
		return function () {
			var a = update([__method.bind(this)], arguments);
			return wrapper.apply(this, a);
		}
	}

	function methodize() {
		if (this._methodized) return this._methodized;
		var __method = this;
		return this._methodized = function () {
			var a = update([this], arguments);
			return __method.apply(null, a);
		};
	}

	return {
		argumentNames: argumentNames,
		bind: bind,
		bindAsEventListener: bindAsEventListener,
		curry: curry,
		delay: delay,
		defer: defer,
		wrap: wrap,
		methodize: methodize
	}
})());



(function (proto) {


	function toISOString() {
		return this.getUTCFullYear() + '-' +
      (this.getUTCMonth() + 1).toPaddedString(2) + '-' +
      this.getUTCDate().toPaddedString(2) + 'T' +
      this.getUTCHours().toPaddedString(2) + ':' +
      this.getUTCMinutes().toPaddedString(2) + ':' +
      this.getUTCSeconds().toPaddedString(2) + 'Z';
	}


	function toJSON() {
		return this.toISOString();
	}

	if (!proto.toISOString) proto.toISOString = toISOString;
	if (!proto.toJSON) proto.toJSON = toJSON;

})(Date.prototype);


RegExp.prototype.match = RegExp.prototype.test;

RegExp.escape = function (str) {
	return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
};
var PeriodicalExecuter = Class.create({
	initialize: function (callback, frequency) {
		this.callback = callback;
		this.frequency = frequency;
		this.currentlyExecuting = false;

		this.registerCallback();
	},

	registerCallback: function () {
		this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
	},

	execute: function () {
		this.callback(this);
	},

	stop: function () {
		if (!this.timer) return;
		clearInterval(this.timer);
		this.timer = null;
	},

	onTimerEvent: function () {
		if (!this.currentlyExecuting) {
			try {
				this.currentlyExecuting = true;
				this.execute();
				this.currentlyExecuting = false;
			} catch (e) {
				this.currentlyExecuting = false;
				throw e;
			}
		}
	}
});
Object.extend(String, {
	interpret: function (value) {
		return value == null ? '' : String(value);
	},
	specialChar: {
		'\b': '\\b',
		'\t': '\\t',
		'\n': '\\n',
		'\f': '\\f',
		'\r': '\\r',
		'\\': '\\\\'
	}
});

Object.extend(String.prototype, (function () {
	var NATIVE_JSON_PARSE_SUPPORT = window.JSON &&
    typeof JSON.parse === 'function' &&
    JSON.parse('{"test": true}').test;

	function prepareReplacement(replacement) {
		if (Object.isFunction(replacement)) return replacement;
		var template = new Template(replacement);
		return function (match) { return template.evaluate(match) };
	}

	function gsub(pattern, replacement) {
		var result = '', source = this, match;
		replacement = prepareReplacement(replacement);

		if (Object.isString(pattern))
			pattern = RegExp.escape(pattern);

		if (!(pattern.length || pattern.source)) {
			replacement = replacement('');
			return replacement + source.split('').join(replacement) + replacement;
		}

		while (source.length > 0) {
			if (match = source.match(pattern)) {
				result += source.slice(0, match.index);
				result += String.interpret(replacement(match));
				source = source.slice(match.index + match[0].length);
			} else {
				result += source, source = '';
			}
		}
		return result;
	}

	function sub(pattern, replacement, count) {
		replacement = prepareReplacement(replacement);
		count = Object.isUndefined(count) ? 1 : count;

		return this.gsub(pattern, function (match) {
			if (--count < 0) return match[0];
			return replacement(match);
		});
	}

	function scan(pattern, iterator) {
		this.gsub(pattern, iterator);
		return String(this);
	}

	function truncate(length, truncation) {
		length = length || 30;
		truncation = Object.isUndefined(truncation) ? '...' : truncation;
		return this.length > length ?
      this.slice(0, length - truncation.length) + truncation : String(this);
	}

	function strip() {
		return this.replace(/^\s+/, '').replace(/\s+$/, '');
	}

	function stripTags() {
		return this.replace(/<\w+(\s+("[^"]*"|'[^']*'|[^>])+)?>|<\/\w+>/gi, '');
	}

	function stripScripts() {
		return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
	}

	function extractScripts() {
		var matchAll = new RegExp(Prototype.ScriptFragment, 'img'),
        matchOne = new RegExp(Prototype.ScriptFragment, 'im');
		return (this.match(matchAll) || []).map(function (scriptTag) {
			return (scriptTag.match(matchOne) || ['', ''])[1];
		});
	}

	function evalScripts() {
		return this.extractScripts().map(function (script) { return eval(script) });
	}

	function escapeHTML() {
		return this.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
	}

	function unescapeHTML() {
		return this.stripTags().replace(/&lt;/g, '<').replace(/&gt;/g, '>').replace(/&amp;/g, '&');
	}


	function toQueryParams(separator) {
		var match = this.strip().match(/([^?#]*)(#.*)?$/);
		if (!match) return {};

		return match[1].split(separator || '&').inject({}, function (hash, pair) {
			if ((pair = pair.split('='))[0]) {
				var key = decodeURIComponent(pair.shift()),
            value = pair.length > 1 ? pair.join('=') : pair[0];

				if (value != undefined) value = decodeURIComponent(value);

				if (key in hash) {
					if (!Object.isArray(hash[key])) hash[key] = [hash[key]];
					hash[key].push(value);
				}
				else hash[key] = value;
			}
			return hash;
		});
	}

	function toArray() {
		return this.split('');
	}

	function succ() {
		return this.slice(0, this.length - 1) +
      String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
	}

	function times(count) {
		return count < 1 ? '' : new Array(count + 1).join(this);
	}

	function camelize() {
		return this.replace(/-+(.)?/g, function (match, chr) {
			return chr ? chr.toUpperCase() : '';
		});
	}

	function capitalize() {
		return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
	}

	function underscore() {
		return this.replace(/::/g, '/')
               .replace(/([A-Z]+)([A-Z][a-z])/g, '$1_$2')
               .replace(/([a-z\d])([A-Z])/g, '$1_$2')
               .replace(/-/g, '_')
               .toLowerCase();
	}

	function dasherize() {
		return this.replace(/_/g, '-');
	}

	function inspect(useDoubleQuotes) {
		var escapedString = this.replace(/[\x00-\x1f\\]/g, function (character) {
			if (character in String.specialChar) {
				return String.specialChar[character];
			}
			return '\\u00' + character.charCodeAt().toPaddedString(2, 16);
		});
		if (useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
		return "'" + escapedString.replace(/'/g, '\\\'') + "'";
	}

	function unfilterJSON(filter) {
		return this.replace(filter || Prototype.JSONFilter, '$1');
	}

	function isJSON() {
		var str = this;
		if (str.blank()) return false;
		str = str.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g, '@');
		str = str.replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g, ']');
		str = str.replace(/(?:^|:|,)(?:\s*\[)+/g, '');
		return (/^[\],:{}\s]*$/).test(str);
	}

	function evalJSON(sanitize) {
		var json = this.unfilterJSON(),
        cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
		if (cx.test(json)) {
			json = json.replace(cx, function (a) {
				return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
			});
		}
		try {
			if (!sanitize || json.isJSON()) return eval('(' + json + ')');
		} catch (e) { }
		throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
	}

	function parseJSON() {
		var json = this.unfilterJSON();
		return JSON.parse(json);
	}

	function include(pattern) {
		return this.indexOf(pattern) > -1;
	}

	function startsWith(pattern) {
		return this.lastIndexOf(pattern, 0) === 0;
	}

	function endsWith(pattern) {
		var d = this.length - pattern.length;
		return d >= 0 && this.indexOf(pattern, d) === d;
	}

	function empty() {
		return this == '';
	}

	function blank() {
		return /^\s*$/.test(this);
	}

	function interpolate(object, pattern) {
		return new Template(this, pattern).evaluate(object);
	}

	return {
		gsub: gsub,
		sub: sub,
		scan: scan,
		truncate: truncate,
		strip: String.prototype.trim || strip,
		stripTags: stripTags,
		stripScripts: stripScripts,
		extractScripts: extractScripts,
		evalScripts: evalScripts,
		escapeHTML: escapeHTML,
		unescapeHTML: unescapeHTML,
		toQueryParams: toQueryParams,
		parseQuery: toQueryParams,
		toArray: toArray,
		succ: succ,
		times: times,
		camelize: camelize,
		capitalize: capitalize,
		underscore: underscore,
		dasherize: dasherize,
		inspect: inspect,
		unfilterJSON: unfilterJSON,
		isJSON: isJSON,
		evalJSON: NATIVE_JSON_PARSE_SUPPORT ? parseJSON : evalJSON,
		include: include,
		startsWith: startsWith,
		endsWith: endsWith,
		empty: empty,
		blank: blank,
		interpolate: interpolate
	};
})());

var Template = Class.create({
	initialize: function (template, pattern) {
		this.template = template.toString();
		this.pattern = pattern || Template.Pattern;
	},

	evaluate: function (object) {
		if (object && Object.isFunction(object.toTemplateReplacements))
			object = object.toTemplateReplacements();

		return this.template.gsub(this.pattern, function (match) {
			if (object == null) return (match[1] + '');

			var before = match[1] || '';
			if (before == '\\') return match[2];

			var ctx = object, expr = match[3],
          pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;

			match = pattern.exec(expr);
			if (match == null) return before;

			while (match != null) {
				var comp = match[1].startsWith('[') ? match[2].replace(/\\\\]/g, ']') : match[1];
				ctx = ctx[comp];
				if (null == ctx || '' == match[3]) break;
				expr = expr.substring('[' == match[3] ? match[1].length : match[0].length);
				match = pattern.exec(expr);
			}

			return before + String.interpret(ctx);
		});
	}
});
Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

var $break = {};

var Enumerable = (function () {
	function each(iterator, context) {
		var index = 0;
		try {
			this._each(function (value) {
				iterator.call(context, value, index++);
			});
		} catch (e) {
			if (e != $break) throw e;
		}
		return this;
	}

	function eachSlice(number, iterator, context) {
		var index = -number, slices = [], array = this.toArray();
		if (number < 1) return array;
		while ((index += number) < array.length)
			slices.push(array.slice(index, index + number));
		return slices.collect(iterator, context);
	}

	function all(iterator, context) {
		iterator = iterator || Prototype.K;
		var result = true;
		this.each(function (value, index) {
			result = result && !!iterator.call(context, value, index);
			if (!result) throw $break;
		});
		return result;
	}

	function any(iterator, context) {
		iterator = iterator || Prototype.K;
		var result = false;
		this.each(function (value, index) {
			if (result = !!iterator.call(context, value, index))
				throw $break;
		});
		return result;
	}

	function collect(iterator, context) {
		iterator = iterator || Prototype.K;
		var results = [];
		this.each(function (value, index) {
			results.push(iterator.call(context, value, index));
		});
		return results;
	}

	function detect(iterator, context) {
		var result;
		this.each(function (value, index) {
			if (iterator.call(context, value, index)) {
				result = value;
				throw $break;
			}
		});
		return result;
	}

	function findAll(iterator, context) {
		var results = [];
		this.each(function (value, index) {
			if (iterator.call(context, value, index))
				results.push(value);
		});
		return results;
	}

	function grep(filter, iterator, context) {
		iterator = iterator || Prototype.K;
		var results = [];

		if (Object.isString(filter))
			filter = new RegExp(RegExp.escape(filter));

		this.each(function (value, index) {
			if (filter.match(value))
				results.push(iterator.call(context, value, index));
		});
		return results;
	}

	function include(object) {
		if (Object.isFunction(this.indexOf))
			if (this.indexOf(object) != -1) return true;

		var found = false;
		this.each(function (value) {
			if (value == object) {
				found = true;
				throw $break;
			}
		});
		return found;
	}

	function inGroupsOf(number, fillWith) {
		fillWith = Object.isUndefined(fillWith) ? null : fillWith;
		return this.eachSlice(number, function (slice) {
			while (slice.length < number) slice.push(fillWith);
			return slice;
		});
	}

	function inject(memo, iterator, context) {
		this.each(function (value, index) {
			memo = iterator.call(context, memo, value, index);
		});
		return memo;
	}

	function invoke(method) {
		var args = $A(arguments).slice(1);
		return this.map(function (value) {
			return value[method].apply(value, args);
		});
	}

	function max(iterator, context) {
		iterator = iterator || Prototype.K;
		var result;
		this.each(function (value, index) {
			value = iterator.call(context, value, index);
			if (result == null || value >= result)
				result = value;
		});
		return result;
	}

	function min(iterator, context) {
		iterator = iterator || Prototype.K;
		var result;
		this.each(function (value, index) {
			value = iterator.call(context, value, index);
			if (result == null || value < result)
				result = value;
		});
		return result;
	}

	function partition(iterator, context) {
		iterator = iterator || Prototype.K;
		var trues = [], falses = [];
		this.each(function (value, index) {
			(iterator.call(context, value, index) ?
        trues : falses).push(value);
		});
		return [trues, falses];
	}

	function pluck(property) {
		var results = [];
		this.each(function (value) {
			results.push(value[property]);
		});
		return results;
	}

	function reject(iterator, context) {
		var results = [];
		this.each(function (value, index) {
			if (!iterator.call(context, value, index))
				results.push(value);
		});
		return results;
	}

	function sortBy(iterator, context) {
		return this.map(function (value, index) {
			return {
				value: value,
				criteria: iterator.call(context, value, index)
			};
		}).sort(function (left, right) {
			var a = left.criteria, b = right.criteria;
			return a < b ? -1 : a > b ? 1 : 0;
		}).pluck('value');
	}

	function toArray() {
		return this.map();
	}

	function zip() {
		var iterator = Prototype.K, args = $A(arguments);
		if (Object.isFunction(args.last()))
			iterator = args.pop();

		var collections = [this].concat(args).map($A);
		return this.map(function (value, index) {
			return iterator(collections.pluck(index));
		});
	}

	function size() {
		return this.toArray().length;
	}

	function inspect() {
		return '#<Enumerable:' + this.toArray().inspect() + '>';
	}









	return {
		each: each,
		eachSlice: eachSlice,
		all: all,
		every: all,
		any: any,
		some: any,
		collect: collect,
		map: collect,
		detect: detect,
		findAll: findAll,
		select: findAll,
		filter: findAll,
		grep: grep,
		include: include,
		member: include,
		inGroupsOf: inGroupsOf,
		inject: inject,
		invoke: invoke,
		max: max,
		min: min,
		partition: partition,
		pluck: pluck,
		reject: reject,
		sortBy: sortBy,
		toArray: toArray,
		entries: toArray,
		zip: zip,
		size: size,
		inspect: inspect,
		find: detect
	};
})();

function $A(iterable) {
	if (!iterable) return [];
	if ('toArray' in Object(iterable)) return iterable.toArray();
	var length = iterable.length || 0, results = new Array(length);
	while (length--) results[length] = iterable[length];
	return results;
}


function $w(string) {
	if (!Object.isString(string)) return [];
	string = string.strip();
	return string ? string.split(/\s+/) : [];
}

Array.from = $A;


(function () {
	var arrayProto = Array.prototype,
      slice = arrayProto.slice,
      _each = arrayProto.forEach; // use native browser JS 1.6 implementation if available

	function each(iterator, context) {
		for (var i = 0, length = this.length >>> 0; i < length; i++) {
			if (i in this) iterator.call(context, this[i], i, this);
		}
	}
	if (!_each) _each = each;

	function clear() {
		this.length = 0;
		return this;
	}

	function first() {
		return this[0];
	}

	function last() {
		return this[this.length - 1];
	}

	function compact() {
		return this.select(function (value) {
			return value != null;
		});
	}

	function flatten() {
		return this.inject([], function (array, value) {
			if (Object.isArray(value))
				return array.concat(value.flatten());
			array.push(value);
			return array;
		});
	}

	function without() {
		var values = slice.call(arguments, 0);
		return this.select(function (value) {
			return !values.include(value);
		});
	}

	function reverse(inline) {
		return (inline === false ? this.toArray() : this)._reverse();
	}

	function uniq(sorted) {
		return this.inject([], function (array, value, index) {
			if (0 == index || (sorted ? array.last() != value : !array.include(value)))
				array.push(value);
			return array;
		});
	}

	function intersect(array) {
		return this.uniq().findAll(function (item) {
			return array.detect(function (value) { return item === value });
		});
	}


	function clone() {
		return slice.call(this, 0);
	}

	function size() {
		return this.length;
	}

	function inspect() {
		return '[' + this.map(Object.inspect).join(', ') + ']';
	}

	function indexOf(item, i) {
		i || (i = 0);
		var length = this.length;
		if (i < 0) i = length + i;
		for (; i < length; i++)
			if (this[i] === item) return i;
		return -1;
	}

	function lastIndexOf(item, i) {
		i = isNaN(i) ? this.length : (i < 0 ? this.length + i : i) + 1;
		var n = this.slice(0, i).reverse().indexOf(item);
		return (n < 0) ? n : i - n - 1;
	}

	function concat() {
		var array = slice.call(this, 0), item;
		for (var i = 0, length = arguments.length; i < length; i++) {
			item = arguments[i];
			if (Object.isArray(item) && !('callee' in item)) {
				for (var j = 0, arrayLength = item.length; j < arrayLength; j++)
					array.push(item[j]);
			} else {
				array.push(item);
			}
		}
		return array;
	}

	Object.extend(arrayProto, Enumerable);

	if (!arrayProto._reverse)
		arrayProto._reverse = arrayProto.reverse;

	Object.extend(arrayProto, {
		_each: _each,
		clear: clear,
		first: first,
		last: last,
		compact: compact,
		flatten: flatten,
		without: without,
		reverse: reverse,
		uniq: uniq,
		intersect: intersect,
		clone: clone,
		toArray: clone,
		size: size,
		inspect: inspect
	});

	var CONCAT_ARGUMENTS_BUGGY = (function () {
		return [].concat(arguments)[0][0] !== 1;
	})(1, 2)

	if (CONCAT_ARGUMENTS_BUGGY) arrayProto.concat = concat;

	if (!arrayProto.indexOf) arrayProto.indexOf = indexOf;
	if (!arrayProto.lastIndexOf) arrayProto.lastIndexOf = lastIndexOf;
})();
function $H(object) {
	return new Hash(object);
};

var Hash = Class.create(Enumerable, (function () {
	function initialize(object) {
		this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
	}


	function _each(iterator) {
		for (var key in this._object) {
			var value = this._object[key], pair = [key, value];
			pair.key = key;
			pair.value = value;
			iterator(pair);
		}
	}

	function set(key, value) {
		return this._object[key] = value;
	}

	function get(key) {
		if (this._object[key] !== Object.prototype[key])
			return this._object[key];
	}

	function unset(key) {
		var value = this._object[key];
		delete this._object[key];
		return value;
	}

	function toObject() {
		return Object.clone(this._object);
	}



	function keys() {
		return this.pluck('key');
	}

	function values() {
		return this.pluck('value');
	}

	function index(value) {
		var match = this.detect(function (pair) {
			return pair.value === value;
		});
		return match && match.key;
	}

	function merge(object) {
		return this.clone().update(object);
	}

	function update(object) {
		return new Hash(object).inject(this, function (result, pair) {
			result.set(pair.key, pair.value);
			return result;
		});
	}

	function toQueryPair(key, value) {
		if (Object.isUndefined(value)) return key;
		return key + '=' + encodeURIComponent(String.interpret(value));
	}

	function toQueryString() {
		return this.inject([], function (results, pair) {
			var key = encodeURIComponent(pair.key), values = pair.value;

			if (values && typeof values == 'object') {
				if (Object.isArray(values)) {
					var queryValues = [];
					for (var i = 0, len = values.length, value; i < len; i++) {
						value = values[i];
						queryValues.push(toQueryPair(key, value));
					}
					return results.concat(queryValues);
				}
			} else results.push(toQueryPair(key, values));
			return results;
		}).join('&');
	}

	function inspect() {
		return '#<Hash:{' + this.map(function (pair) {
			return pair.map(Object.inspect).join(': ');
		}).join(', ') + '}>';
	}

	function clone() {
		return new Hash(this);
	}

	return {
		initialize: initialize,
		_each: _each,
		set: set,
		get: get,
		unset: unset,
		toObject: toObject,
		toTemplateReplacements: toObject,
		keys: keys,
		values: values,
		index: index,
		merge: merge,
		update: update,
		toQueryString: toQueryString,
		inspect: inspect,
		toJSON: toObject,
		clone: clone
	};
})());

Hash.from = $H;
Object.extend(Number.prototype, (function () {
	function toColorPart() {
		return this.toPaddedString(2, 16);
	}

	function succ() {
		return this + 1;
	}

	function times(iterator, context) {
		$R(0, this, true).each(iterator, context);
		return this;
	}

	function toPaddedString(length, radix) {
		var string = this.toString(radix || 10);
		return '0'.times(length - string.length) + string;
	}

	function abs() {
		return Math.abs(this);
	}

	function round() {
		return Math.round(this);
	}

	function ceil() {
		return Math.ceil(this);
	}

	function floor() {
		return Math.floor(this);
	}

	return {
		toColorPart: toColorPart,
		succ: succ,
		times: times,
		toPaddedString: toPaddedString,
		abs: abs,
		round: round,
		ceil: ceil,
		floor: floor
	};
})());

function $R(start, end, exclusive) {
	return new ObjectRange(start, end, exclusive);
}

var ObjectRange = Class.create(Enumerable, (function () {
	function initialize(start, end, exclusive) {
		this.start = start;
		this.end = end;
		this.exclusive = exclusive;
	}

	function _each(iterator) {
		var value = this.start;
		while (this.include(value)) {
			iterator(value);
			value = value.succ();
		}
	}

	function include(value) {
		if (value < this.start)
			return false;
		if (this.exclusive)
			return value < this.end;
		return value <= this.end;
	}

	return {
		initialize: initialize,
		_each: _each,
		include: include
	};
})());



var Ajax = {
	getTransport: function () {
		return Try.these(
      function () { return new XMLHttpRequest() },
      function () { return new ActiveXObject('Msxml2.XMLHTTP') },
      function () { return new ActiveXObject('Microsoft.XMLHTTP') }
    ) || false;
	},

	activeRequestCount: 0
};

Ajax.Responders = {
	responders: [],

	_each: function (iterator) {
		this.responders._each(iterator);
	},

	register: function (responder) {
		if (!this.include(responder))
			this.responders.push(responder);
	},

	unregister: function (responder) {
		this.responders = this.responders.without(responder);
	},

	dispatch: function (callback, request, transport, json) {
		this.each(function (responder) {
			if (Object.isFunction(responder[callback])) {
				try {
					responder[callback].apply(responder, [request, transport, json]);
				} catch (e) { }
			}
		});
	}
};

Object.extend(Ajax.Responders, Enumerable);

Ajax.Responders.register({
	onCreate: function () { Ajax.activeRequestCount++ },
	onComplete: function () { Ajax.activeRequestCount-- }
});
Ajax.Base = Class.create({
	initialize: function (options) {
		this.options = {
			method: 'post',
			asynchronous: true,
			contentType: 'application/x-www-form-urlencoded',
			encoding: 'UTF-8',
			parameters: '',
			evalJSON: true,
			evalJS: true
		};
		Object.extend(this.options, options || {});

		this.options.method = this.options.method.toLowerCase();

		if (Object.isHash(this.options.parameters))
			this.options.parameters = this.options.parameters.toObject();
	}
});
Ajax.Request = Class.create(Ajax.Base, {
	_complete: false,

	initialize: function ($super, url, options) {
		$super(options);
		this.transport = Ajax.getTransport();
		this.request(url);
	},

	request: function (url) {
		this.url = url;
		this.method = this.options.method;
		var params = Object.isString(this.options.parameters) ?
          this.options.parameters :
          Object.toQueryString(this.options.parameters);

		if (!['get', 'post'].include(this.method)) {
			params += (params ? '&' : '') + "_method=" + this.method;
			this.method = 'post';
		}

		if (params && this.method === 'get') {
			this.url += (this.url.include('?') ? '&' : '?') + params;
		}

		this.parameters = params.toQueryParams();

		try {
			var response = new Ajax.Response(this);
			if (this.options.onCreate) this.options.onCreate(response);
			Ajax.Responders.dispatch('onCreate', this, response);

			this.transport.open(this.method.toUpperCase(), this.url,
        this.options.asynchronous);

			if (this.options.asynchronous) this.respondToReadyState.bind(this).defer(1);

			this.transport.onreadystatechange = this.onStateChange.bind(this);
			this.setRequestHeaders();

			this.body = this.method == 'post' ? (this.options.postBody || params) : null;
			this.transport.send(this.body);

			/* Force Firefox to handle ready state 4 for synchronous requests */
			if (!this.options.asynchronous && this.transport.overrideMimeType)
				this.onStateChange();

		}
		catch (e) {
			this.dispatchException(e);
		}
	},

	onStateChange: function () {
		var readyState = this.transport.readyState;
		if (readyState > 1 && !((readyState == 4) && this._complete))
			this.respondToReadyState(this.transport.readyState);
	},

	setRequestHeaders: function () {
		var headers = {
			'X-Requested-With': 'XMLHttpRequest',
			'X-Prototype-Version': Prototype.Version,
			'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'
		};

		if (this.method == 'post') {
			headers['Content-type'] = this.options.contentType +
        (this.options.encoding ? '; charset=' + this.options.encoding : '');

			/* Force "Connection: close" for older Mozilla browsers to work
			* around a bug where XMLHttpRequest sends an incorrect
			* Content-length header. See Mozilla Bugzilla #246651.
			*/
			if (this.transport.overrideMimeType &&
          (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0, 2005])[1] < 2005)
				headers['Connection'] = 'close';
		}

		if (typeof this.options.requestHeaders == 'object') {
			var extras = this.options.requestHeaders;

			if (Object.isFunction(extras.push))
				for (var i = 0, length = extras.length; i < length; i += 2)
					headers[extras[i]] = extras[i + 1];
			else
				$H(extras).each(function (pair) { headers[pair.key] = pair.value });
		}

		for (var name in headers)
			this.transport.setRequestHeader(name, headers[name]);
	},

	success: function () {
		var status = this.getStatus();
		return !status || (status >= 200 && status < 300) || status == 304;
	},

	getStatus: function () {
		try {
			if (this.transport.status === 1223) return 204;
			return this.transport.status || 0;
		} catch (e) { return 0 }
	},

	respondToReadyState: function (readyState) {
		var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);

		if (state == 'Complete') {
			try {
				this._complete = true;
				(this.options['on' + response.status]
         || this.options['on' + (this.success() ? 'Success' : 'Failure')]
         || Prototype.emptyFunction)(response, response.headerJSON);
			} catch (e) {
				this.dispatchException(e);
			}

			var contentType = response.getHeader('Content-type');
			if (this.options.evalJS == 'force'
          || (this.options.evalJS && this.isSameOrigin() && contentType
          && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/i)))
				this.evalResponse();
		}

		try {
			(this.options['on' + state] || Prototype.emptyFunction)(response, response.headerJSON);
			Ajax.Responders.dispatch('on' + state, this, response, response.headerJSON);
		} catch (e) {
			this.dispatchException(e);
		}

		if (state == 'Complete') {
			this.transport.onreadystatechange = Prototype.emptyFunction;
		}
	},

	isSameOrigin: function () {
		var m = this.url.match(/^\s*https?:\/\/[^\/]*/);
		return !m || (m[0] == '#{protocol}//#{domain}#{port}'.interpolate({
			protocol: location.protocol,
			domain: document.domain,
			port: location.port ? ':' + location.port : ''
		}));
	},

	getHeader: function (name) {
		try {
			return this.transport.getResponseHeader(name) || null;
		} catch (e) { return null; }
	},

	evalResponse: function () {
		try {
			return eval((this.transport.responseText || '').unfilterJSON());
		} catch (e) {
			this.dispatchException(e);
		}
	},

	dispatchException: function (exception) {
		(this.options.onException || Prototype.emptyFunction)(this, exception);
		Ajax.Responders.dispatch('onException', this, exception);
	}
});

Ajax.Request.Events =
  ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];








Ajax.Response = Class.create({
	initialize: function (request) {
		this.request = request;
		var transport = this.transport = request.transport,
        readyState = this.readyState = transport.readyState;

		if ((readyState > 2 && !Prototype.Browser.IE) || readyState == 4) {
			this.status = this.getStatus();
			this.statusText = this.getStatusText();
			this.responseText = String.interpret(transport.responseText);
			this.headerJSON = this._getHeaderJSON();
		}

		if (readyState == 4) {
			var xml = transport.responseXML;
			this.responseXML = Object.isUndefined(xml) ? null : xml;
			this.responseJSON = this._getResponseJSON();
		}
	},

	status: 0,

	statusText: '',

	getStatus: Ajax.Request.prototype.getStatus,

	getStatusText: function () {
		try {
			return this.transport.statusText || '';
		} catch (e) { return '' }
	},

	getHeader: Ajax.Request.prototype.getHeader,

	getAllHeaders: function () {
		try {
			return this.getAllResponseHeaders();
		} catch (e) { return null }
	},

	getResponseHeader: function (name) {
		return this.transport.getResponseHeader(name);
	},

	getAllResponseHeaders: function () {
		return this.transport.getAllResponseHeaders();
	},

	_getHeaderJSON: function () {
		var json = this.getHeader('X-JSON');
		if (!json) return null;
		json = decodeURIComponent(escape(json));
		try {
			return json.evalJSON(this.request.options.sanitizeJSON ||
        !this.request.isSameOrigin());
		} catch (e) {
			this.request.dispatchException(e);
		}
	},

	_getResponseJSON: function () {
		var options = this.request.options;
		if (!options.evalJSON || (options.evalJSON != 'force' &&
      !(this.getHeader('Content-type') || '').include('application/json')) ||
        this.responseText.blank())
			return null;
		try {
			return this.responseText.evalJSON(options.sanitizeJSON ||
        !this.request.isSameOrigin());
		} catch (e) {
			this.request.dispatchException(e);
		}
	}
});

Ajax.Updater = Class.create(Ajax.Request, {
	initialize: function ($super, container, url, options) {
		this.container = {
			success: (container.success || container),
			failure: (container.failure || (container.success ? null : container))
		};

		options = Object.clone(options);
		var onComplete = options.onComplete;
		options.onComplete = (function (response, json) {
			this.updateContent(response.responseText);
			if (Object.isFunction(onComplete)) onComplete(response, json);
		}).bind(this);

		$super(url, options);
	},

	updateContent: function (responseText) {
		var receiver = this.container[this.success() ? 'success' : 'failure'],
        options = this.options;

		if (!options.evalScripts) responseText = responseText.stripScripts();

		if (receiver = $(receiver)) {
			if (options.insertion) {
				if (Object.isString(options.insertion)) {
					var insertion = {}; insertion[options.insertion] = responseText;
					receiver.insert(insertion);
				}
				else options.insertion(receiver, responseText);
			}
			else receiver.update(responseText);
		}
	}
});

Ajax.PeriodicalUpdater = Class.create(Ajax.Base, {
	initialize: function ($super, container, url, options) {
		$super(options);
		this.onComplete = this.options.onComplete;

		this.frequency = (this.options.frequency || 2);
		this.decay = (this.options.decay || 1);

		this.updater = {};
		this.container = container;
		this.url = url;

		this.start();
	},

	start: function () {
		this.options.onComplete = this.updateComplete.bind(this);
		this.onTimerEvent();
	},

	stop: function () {
		this.updater.options.onComplete = undefined;
		clearTimeout(this.timer);
		(this.onComplete || Prototype.emptyFunction).apply(this, arguments);
	},

	updateComplete: function (response) {
		if (this.options.decay) {
			this.decay = (response.responseText == this.lastText ?
        this.decay * this.options.decay : 1);

			this.lastText = response.responseText;
		}
		this.timer = this.onTimerEvent.bind(this).delay(this.decay * this.frequency);
	},

	onTimerEvent: function () {
		this.updater = new Ajax.Updater(this.container, this.url, this.options);
	}
});


function $(element) {
	if (arguments.length > 1) {
		for (var i = 0, elements = [], length = arguments.length; i < length; i++)
			elements.push($(arguments[i]));
		return elements;
	}
	if (Object.isString(element))
		element = document.getElementById(element);
	return Element.extend(element);
}

if (Prototype.BrowserFeatures.XPath) {
	document._getElementsByXPath = function (expression, parentElement) {
		var results = [];
		var query = document.evaluate(expression, $(parentElement) || document,
      null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
		for (var i = 0, length = query.snapshotLength; i < length; i++)
			results.push(Element.extend(query.snapshotItem(i)));
		return results;
	};
}

/*--------------------------------------------------------------------------*/

if (!Node) var Node = {};

if (!Node.ELEMENT_NODE) {
	Object.extend(Node, {
		ELEMENT_NODE: 1,
		ATTRIBUTE_NODE: 2,
		TEXT_NODE: 3,
		CDATA_SECTION_NODE: 4,
		ENTITY_REFERENCE_NODE: 5,
		ENTITY_NODE: 6,
		PROCESSING_INSTRUCTION_NODE: 7,
		COMMENT_NODE: 8,
		DOCUMENT_NODE: 9,
		DOCUMENT_TYPE_NODE: 10,
		DOCUMENT_FRAGMENT_NODE: 11,
		NOTATION_NODE: 12
	});
}



(function (global) {
	function shouldUseCache(tagName, attributes) {
		if (tagName === 'select') return false;
		if ('type' in attributes) return false;
		return true;
	}

	var HAS_EXTENDED_CREATE_ELEMENT_SYNTAX = (function () {
		try {
			var el = document.createElement('<input name="x">');
			return el.tagName.toLowerCase() === 'input' && el.name === 'x';
		}
		catch (err) {
			return false;
		}
	})();

	var element = global.Element;

	global.Element = function (tagName, attributes) {
		attributes = attributes || {};
		tagName = tagName.toLowerCase();
		var cache = Element.cache;

		if (HAS_EXTENDED_CREATE_ELEMENT_SYNTAX && attributes.name) {
			tagName = '<' + tagName + ' name="' + attributes.name + '">';
			delete attributes.name;
			return Element.writeAttribute(document.createElement(tagName), attributes);
		}

		if (!cache[tagName]) cache[tagName] = Element.extend(document.createElement(tagName));

		var node = shouldUseCache(tagName, attributes) ?
     cache[tagName].cloneNode(false) : document.createElement(tagName);

		return Element.writeAttribute(node, attributes);
	};

	Object.extend(global.Element, element || {});
	if (element) global.Element.prototype = element.prototype;

})(this);

Element.idCounter = 1;
Element.cache = {};

Element._purgeElement = function (element) {
	var uid = element._prototypeUID;
	if (uid) {
		Element.stopObserving(element);
		element._prototypeUID = void 0;
		delete Element.Storage[uid];
	}
}

Element.Methods = {
	visible: function (element) {
		return $(element).style.display != 'none';
	},

	toggle: function (element) {
		element = $(element);
		Element[Element.visible(element) ? 'hide' : 'show'](element);
		return element;
	},

	hide: function (element) {
		element = $(element);
		element.style.display = 'none';
		return element;
	},

	show: function (element) {
		element = $(element);
		element.style.display = '';
		return element;
	},

	remove: function (element) {
		element = $(element);
		element.parentNode.removeChild(element);
		return element;
	},

	update: (function () {

		var SELECT_ELEMENT_INNERHTML_BUGGY = (function () {
			var el = document.createElement("select"),
          isBuggy = true;
			el.innerHTML = "<option value=\"test\">test</option>";
			if (el.options && el.options[0]) {
				isBuggy = el.options[0].nodeName.toUpperCase() !== "OPTION";
			}
			el = null;
			return isBuggy;
		})();

		var TABLE_ELEMENT_INNERHTML_BUGGY = (function () {
			try {
				var el = document.createElement("table");
				if (el && el.tBodies) {
					el.innerHTML = "<tbody><tr><td>test</td></tr></tbody>";
					var isBuggy = typeof el.tBodies[0] == "undefined";
					el = null;
					return isBuggy;
				}
			} catch (e) {
				return true;
			}
		})();

		var LINK_ELEMENT_INNERHTML_BUGGY = (function () {
			try {
				var el = document.createElement('div');
				el.innerHTML = "<link>";
				var isBuggy = (el.childNodes.length === 0);
				el = null;
				return isBuggy;
			} catch (e) {
				return true;
			}
		})();

		var ANY_INNERHTML_BUGGY = SELECT_ELEMENT_INNERHTML_BUGGY ||
     TABLE_ELEMENT_INNERHTML_BUGGY || LINK_ELEMENT_INNERHTML_BUGGY;

		var SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING = (function () {
			var s = document.createElement("script"),
          isBuggy = false;
			try {
				s.appendChild(document.createTextNode(""));
				isBuggy = !s.firstChild ||
          s.firstChild && s.firstChild.nodeType !== 3;
			} catch (e) {
				isBuggy = true;
			}
			s = null;
			return isBuggy;
		})();


		function update(element, content) {
			element = $(element);
			var purgeElement = Element._purgeElement;

			var descendants = element.getElementsByTagName('*'),
       i = descendants.length;
			while (i--) purgeElement(descendants[i]);

			if (content && content.toElement)
				content = content.toElement();

			if (Object.isElement(content))
				return element.update().insert(content);

			content = Object.toHTML(content);

			var tagName = element.tagName.toUpperCase();

			if (tagName === 'SCRIPT' && SCRIPT_ELEMENT_REJECTS_TEXTNODE_APPENDING) {
				element.text = content;
				return element;
			}

			if (ANY_INNERHTML_BUGGY) {
				if (tagName in Element._insertionTranslations.tags) {
					while (element.firstChild) {
						element.removeChild(element.firstChild);
					}
					Element._getContentFromAnonymousElement(tagName, content.stripScripts())
            .each(function (node) {
            	element.appendChild(node)
            });
				} else if (LINK_ELEMENT_INNERHTML_BUGGY && Object.isString(content) && content.indexOf('<link') > -1) {
					while (element.firstChild) {
						element.removeChild(element.firstChild);
					}
					var nodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts(), true);
					nodes.each(function (node) { element.appendChild(node) });
				}
				else {
					element.innerHTML = content.stripScripts();
				}
			}
			else {
				element.innerHTML = content.stripScripts();
			}

			content.evalScripts.bind(content).defer();
			return element;
		}

		return update;
	})(),

	replace: function (element, content) {
		element = $(element);
		if (content && content.toElement) content = content.toElement();
		else if (!Object.isElement(content)) {
			content = Object.toHTML(content);
			var range = element.ownerDocument.createRange();
			range.selectNode(element);
			content.evalScripts.bind(content).defer();
			content = range.createContextualFragment(content.stripScripts());
		}
		element.parentNode.replaceChild(content, element);
		return element;
	},

	insert: function (element, insertions) {
		element = $(element);

		if (Object.isString(insertions) || Object.isNumber(insertions) ||
        Object.isElement(insertions) || (insertions && (insertions.toElement || insertions.toHTML)))
			insertions = { bottom: insertions };

		var content, insert, tagName, childNodes;

		for (var position in insertions) {
			content = insertions[position];
			position = position.toLowerCase();
			insert = Element._insertionTranslations[position];

			if (content && content.toElement) content = content.toElement();
			if (Object.isElement(content)) {
				insert(element, content);
				continue;
			}

			content = Object.toHTML(content);

			tagName = ((position == 'before' || position == 'after')
        ? element.parentNode : element).tagName.toUpperCase();

			childNodes = Element._getContentFromAnonymousElement(tagName, content.stripScripts());

			if (position == 'top' || position == 'after') childNodes.reverse();
			childNodes.each(insert.curry(element));

			content.evalScripts.bind(content).defer();
		}

		return element;
	},

	wrap: function (element, wrapper, attributes) {
		element = $(element);
		if (Object.isElement(wrapper))
			$(wrapper).writeAttribute(attributes || {});
		else if (Object.isString(wrapper)) wrapper = new Element(wrapper, attributes);
		else wrapper = new Element('div', wrapper);
		if (element.parentNode)
			element.parentNode.replaceChild(wrapper, element);
		wrapper.appendChild(element);
		return wrapper;
	},

	inspect: function (element) {
		element = $(element);
		var result = '<' + element.tagName.toLowerCase();
		$H({ 'id': 'id', 'className': 'class' }).each(function (pair) {
			var property = pair.first(),
          attribute = pair.last(),
          value = (element[property] || '').toString();
			if (value) result += ' ' + attribute + '=' + value.inspect(true);
		});
		return result + '>';
	},

	recursivelyCollect: function (element, property, maximumLength) {
		element = $(element);
		maximumLength = maximumLength || -1;
		var elements = [];

		while (element = element[property]) {
			if (element.nodeType == 1)
				elements.push(Element.extend(element));
			if (elements.length == maximumLength)
				break;
		}

		return elements;
	},

	ancestors: function (element) {
		return Element.recursivelyCollect(element, 'parentNode');
	},

	descendants: function (element) {
		return Element.select(element, "*");
	},

	firstDescendant: function (element) {
		element = $(element).firstChild;
		while (element && element.nodeType != 1) element = element.nextSibling;
		return $(element);
	},

	immediateDescendants: function (element) {
		var results = [], child = $(element).firstChild;
		while (child) {
			if (child.nodeType === 1) {
				results.push(Element.extend(child));
			}
			child = child.nextSibling;
		}
		return results;
	},

	previousSiblings: function (element, maximumLength) {
		return Element.recursivelyCollect(element, 'previousSibling');
	},

	nextSiblings: function (element) {
		return Element.recursivelyCollect(element, 'nextSibling');
	},

	siblings: function (element) {
		element = $(element);
		return Element.previousSiblings(element).reverse()
      .concat(Element.nextSiblings(element));
	},

	match: function (element, selector) {
		element = $(element);
		if (Object.isString(selector))
			return Prototype.Selector.match(element, selector);
		return selector.match(element);
	},

	up: function (element, expression, index) {
		element = $(element);
		if (arguments.length == 1) return $(element.parentNode);
		var ancestors = Element.ancestors(element);
		return Object.isNumber(expression) ? ancestors[expression] :
      Prototype.Selector.find(ancestors, expression, index);
	},

	down: function (element, expression, index) {
		element = $(element);
		if (arguments.length == 1) return Element.firstDescendant(element);
		return Object.isNumber(expression) ? Element.descendants(element)[expression] :
      Element.select(element, expression)[index || 0];
	},

	previous: function (element, expression, index) {
		element = $(element);
		if (Object.isNumber(expression)) index = expression, expression = false;
		if (!Object.isNumber(index)) index = 0;

		if (expression) {
			return Prototype.Selector.find(element.previousSiblings(), expression, index);
		} else {
			return element.recursivelyCollect("previousSibling", index + 1)[index];
		}
	},

	next: function (element, expression, index) {
		element = $(element);
		if (Object.isNumber(expression)) index = expression, expression = false;
		if (!Object.isNumber(index)) index = 0;

		if (expression) {
			return Prototype.Selector.find(element.nextSiblings(), expression, index);
		} else {
			var maximumLength = Object.isNumber(index) ? index + 1 : 1;
			return element.recursivelyCollect("nextSibling", index + 1)[index];
		}
	},


	select: function (element) {
		element = $(element);
		var expressions = Array.prototype.slice.call(arguments, 1).join(', ');
		return Prototype.Selector.select(expressions, element);
	},

	adjacent: function (element) {
		element = $(element);
		var expressions = Array.prototype.slice.call(arguments, 1).join(', ');
		return Prototype.Selector.select(expressions, element.parentNode).without(element);
	},

	identify: function (element) {
		element = $(element);
		var id = Element.readAttribute(element, 'id');
		if (id) return id;
		do { id = 'anonymous_element_' + Element.idCounter++ } while ($(id));
		Element.writeAttribute(element, 'id', id);
		return id;
	},

	readAttribute: function (element, name) {
		element = $(element);
		if (Prototype.Browser.IE) {
			var t = Element._attributeTranslations.read;
			if (t.values[name]) return t.values[name](element, name);
			if (t.names[name]) name = t.names[name];
			if (name.include(':')) {
				return (!element.attributes || !element.attributes[name]) ? null :
         element.attributes[name].value;
			}
		}
		return element.getAttribute(name);
	},

	writeAttribute: function (element, name, value) {
		element = $(element);
		var attributes = {}, t = Element._attributeTranslations.write;

		if (typeof name == 'object') attributes = name;
		else attributes[name] = Object.isUndefined(value) ? true : value;

		for (var attr in attributes) {
			name = t.names[attr] || attr;
			value = attributes[attr];
			if (t.values[attr]) name = t.values[attr](element, value);
			if (value === false || value === null)
				element.removeAttribute(name);
			else if (value === true)
				element.setAttribute(name, name);
			else element.setAttribute(name, value);
		}
		return element;
	},

	getHeight: function (element) {
		return Element.getDimensions(element).height;
	},

	getWidth: function (element) {
		return Element.getDimensions(element).width;
	},

	classNames: function (element) {
		return new Element.ClassNames(element);
	},

	hasClassName: function (element, className) {
		if (!(element = $(element))) return;
		var elementClassName = element.className;
		return (elementClassName.length > 0 && (elementClassName == className ||
      new RegExp("(^|\\s)" + className + "(\\s|$)").test(elementClassName)));
	},

	addClassName: function (element, className) {
		if (!(element = $(element))) return;
		if (!Element.hasClassName(element, className))
			element.className += (element.className ? ' ' : '') + className;
		return element;
	},

	removeClassName: function (element, className) {
		if (!(element = $(element))) return;
		element.className = element.className.replace(
      new RegExp("(^|\\s+)" + className + "(\\s+|$)"), ' ').strip();
		return element;
	},

	toggleClassName: function (element, className) {
		if (!(element = $(element))) return;
		return Element[Element.hasClassName(element, className) ?
      'removeClassName' : 'addClassName'](element, className);
	},

	cleanWhitespace: function (element) {
		element = $(element);
		var node = element.firstChild;
		while (node) {
			var nextNode = node.nextSibling;
			if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
				element.removeChild(node);
			node = nextNode;
		}
		return element;
	},

	empty: function (element) {
		return $(element).innerHTML.blank();
	},

	descendantOf: function (element, ancestor) {
		element = $(element), ancestor = $(ancestor);

		if (element.compareDocumentPosition)
			return (element.compareDocumentPosition(ancestor) & 8) === 8;

		if (ancestor.contains)
			return ancestor.contains(element) && ancestor !== element;

		while (element = element.parentNode)
			if (element == ancestor) return true;

		return false;
	},

	scrollTo: function (element) {
		element = $(element);
		var pos = Element.cumulativeOffset(element);
		window.scrollTo(pos[0], pos[1]);
		return element;
	},

	getStyle: function (element, style) {
		element = $(element);
		style = style == 'float' ? 'cssFloat' : style.camelize();
		var value = element.style[style];
		if (!value || value == 'auto') {
			var css = document.defaultView.getComputedStyle(element, null);
			value = css ? css[style] : null;
		}
		if (style == 'opacity') return value ? parseFloat(value) : 1.0;
		return value == 'auto' ? null : value;
	},

	getOpacity: function (element) {
		return $(element).getStyle('opacity');
	},

	setStyle: function (element, styles) {
		element = $(element);
		var elementStyle = element.style, match;
		if (Object.isString(styles)) {
			element.style.cssText += ';' + styles;
			return styles.include('opacity') ?
        element.setOpacity(styles.match(/opacity:\s*(\d?\.?\d*)/)[1]) : element;
		}
		for (var property in styles)
			if (property == 'opacity') element.setOpacity(styles[property]);
			else
				elementStyle[(property == 'float' || property == 'cssFloat') ?
          (Object.isUndefined(elementStyle.styleFloat) ? 'cssFloat' : 'styleFloat') :
            property] = styles[property];

		return element;
	},

	setOpacity: function (element, value) {
		element = $(element);
		element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;
		return element;
	},

	makePositioned: function (element) {
		element = $(element);
		var pos = Element.getStyle(element, 'position');
		if (pos == 'static' || !pos) {
			element._madePositioned = true;
			element.style.position = 'relative';
			if (Prototype.Browser.Opera) {
				element.style.top = 0;
				element.style.left = 0;
			}
		}
		return element;
	},

	undoPositioned: function (element) {
		element = $(element);
		if (element._madePositioned) {
			element._madePositioned = undefined;
			element.style.position =
        element.style.top =
        element.style.left =
        element.style.bottom =
        element.style.right = '';
		}
		return element;
	},

	makeClipping: function (element) {
		element = $(element);
		if (element._overflow) return element;
		element._overflow = Element.getStyle(element, 'overflow') || 'auto';
		if (element._overflow !== 'hidden')
			element.style.overflow = 'hidden';
		return element;
	},

	undoClipping: function (element) {
		element = $(element);
		if (!element._overflow) return element;
		element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;
		element._overflow = null;
		return element;
	},

	clonePosition: function (element, source) {
		var options = Object.extend({
			setLeft: true,
			setTop: true,
			setWidth: true,
			setHeight: true,
			offsetTop: 0,
			offsetLeft: 0
		}, arguments[2] || {});

		source = $(source);
		var p = Element.viewportOffset(source), delta = [0, 0], parent = null;

		element = $(element);

		if (Element.getStyle(element, 'position') == 'absolute') {
			parent = Element.getOffsetParent(element);
			delta = Element.viewportOffset(parent);
		}

		if (parent == document.body) {
			delta[0] -= document.body.offsetLeft;
			delta[1] -= document.body.offsetTop;
		}

		if (options.setLeft) element.style.left = (p[0] - delta[0] + options.offsetLeft) + 'px';
		if (options.setTop) element.style.top = (p[1] - delta[1] + options.offsetTop) + 'px';
		if (options.setWidth) element.style.width = source.offsetWidth + 'px';
		if (options.setHeight) element.style.height = source.offsetHeight + 'px';
		return element;
	}
};

Object.extend(Element.Methods, {
	getElementsBySelector: Element.Methods.select,

	childElements: Element.Methods.immediateDescendants
});

Element._attributeTranslations = {
	write: {
		names: {
			className: 'class',
			htmlFor: 'for'
		},
		values: {}
	}
};

if (Prototype.Browser.Opera) {
	Element.Methods.getStyle = Element.Methods.getStyle.wrap(
    function (proceed, element, style) {
    	switch (style) {
    		case 'height': case 'width':
    			if (!Element.visible(element)) return null;

    			var dim = parseInt(proceed(element, style), 10);

    			if (dim !== element['offset' + style.capitalize()])
    				return dim + 'px';

    			var properties;
    			if (style === 'height') {
    				properties = ['border-top-width', 'padding-top',
             'padding-bottom', 'border-bottom-width'];
    			}
    			else {
    				properties = ['border-left-width', 'padding-left',
             'padding-right', 'border-right-width'];
    			}
    			return properties.inject(dim, function (memo, property) {
    				var val = proceed(element, property);
    				return val === null ? memo : memo - parseInt(val, 10);
    			}) + 'px';
    		default: return proceed(element, style);
    	}
    }
  );

	Element.Methods.readAttribute = Element.Methods.readAttribute.wrap(
    function (proceed, element, attribute) {
    	if (attribute === 'title') return element.title;
    	return proceed(element, attribute);
    }
  );
}

else if (Prototype.Browser.IE) {
	Element.Methods.getStyle = function (element, style) {
		element = $(element);
		style = (style == 'float' || style == 'cssFloat') ? 'styleFloat' : style.camelize();
		var value = element.style[style];
		if (!value && element.currentStyle) value = element.currentStyle[style];

		if (style == 'opacity') {
			if (value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))
				if (value[1]) return parseFloat(value[1]) / 100;
			return 1.0;
		}

		if (value == 'auto') {
			if ((style == 'width' || style == 'height') && (element.getStyle('display') != 'none'))
				return element['offset' + style.capitalize()] + 'px';
			return null;
		}
		return value;
	};

	Element.Methods.setOpacity = function (element, value) {
		function stripAlpha(filter) {
			return filter.replace(/alpha\([^\)]*\)/gi, '');
		}
		element = $(element);
		var currentStyle = element.currentStyle;
		if ((currentStyle && !currentStyle.hasLayout) ||
      (!currentStyle && element.style.zoom == 'normal'))
			element.style.zoom = 1;

		var filter = element.getStyle('filter'), style = element.style;
		if (value == 1 || value === '') {
			(filter = stripAlpha(filter)) ?
        style.filter = filter : style.removeAttribute('filter');
			return element;
		} else if (value < 0.00001) value = 0;
		style.filter = stripAlpha(filter) +
      'alpha(opacity=' + (value * 100) + ')';
		return element;
	};

	Element._attributeTranslations = (function () {

		var classProp = 'className',
        forProp = 'for',
        el = document.createElement('div');

		el.setAttribute(classProp, 'x');

		if (el.className !== 'x') {
			el.setAttribute('class', 'x');
			if (el.className === 'x') {
				classProp = 'class';
			}
		}
		el = null;

		el = document.createElement('label');
		el.setAttribute(forProp, 'x');
		if (el.htmlFor !== 'x') {
			el.setAttribute('htmlFor', 'x');
			if (el.htmlFor === 'x') {
				forProp = 'htmlFor';
			}
		}
		el = null;

		return {
			read: {
				names: {
					'class': classProp,
					'className': classProp,
					'for': forProp,
					'htmlFor': forProp
				},
				values: {
					_getAttr: function (element, attribute) {
						return element.getAttribute(attribute);
					},
					_getAttr2: function (element, attribute) {
						return element.getAttribute(attribute, 2);
					},
					_getAttrNode: function (element, attribute) {
						var node = element.getAttributeNode(attribute);
						return node ? node.value : "";
					},
					_getEv: (function () {

						var el = document.createElement('div'), f;
						el.onclick = Prototype.emptyFunction;
						var value = el.getAttribute('onclick');

						if (String(value).indexOf('{') > -1) {
							f = function (element, attribute) {
								attribute = element.getAttribute(attribute);
								if (!attribute) return null;
								attribute = attribute.toString();
								attribute = attribute.split('{')[1];
								attribute = attribute.split('}')[0];
								return attribute.strip();
							};
						}
						else if (value === '') {
							f = function (element, attribute) {
								attribute = element.getAttribute(attribute);
								if (!attribute) return null;
								return attribute.strip();
							};
						}
						el = null;
						return f;
					})(),
					_flag: function (element, attribute) {
						return $(element).hasAttribute(attribute) ? attribute : null;
					},
					style: function (element) {
						return element.style.cssText.toLowerCase();
					},
					title: function (element) {
						return element.title;
					}
				}
			}
		}
	})();

	Element._attributeTranslations.write = {
		names: Object.extend({
			cellpadding: 'cellPadding',
			cellspacing: 'cellSpacing'
		}, Element._attributeTranslations.read.names),
		values: {
			checked: function (element, value) {
				element.checked = !!value;
			},

			style: function (element, value) {
				element.style.cssText = value ? value : '';
			}
		}
	};

	Element._attributeTranslations.has = {};

	$w('colSpan rowSpan vAlign dateTime accessKey tabIndex ' +
      'encType maxLength readOnly longDesc frameBorder').each(function (attr) {
      	Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
      	Element._attributeTranslations.has[attr.toLowerCase()] = attr;
      });

	(function (v) {
		Object.extend(v, {
			href: v._getAttr2,
			src: v._getAttr2,
			type: v._getAttr,
			action: v._getAttrNode,
			disabled: v._flag,
			checked: v._flag,
			readonly: v._flag,
			multiple: v._flag,
			onload: v._getEv,
			onunload: v._getEv,
			onclick: v._getEv,
			ondblclick: v._getEv,
			onmousedown: v._getEv,
			onmouseup: v._getEv,
			onmouseover: v._getEv,
			onmousemove: v._getEv,
			onmouseout: v._getEv,
			onfocus: v._getEv,
			onblur: v._getEv,
			onkeypress: v._getEv,
			onkeydown: v._getEv,
			onkeyup: v._getEv,
			onsubmit: v._getEv,
			onreset: v._getEv,
			onselect: v._getEv,
			onchange: v._getEv
		});
	})(Element._attributeTranslations.read.values);

	if (Prototype.BrowserFeatures.ElementExtensions) {
		(function () {
			function _descendants(element) {
				var nodes = element.getElementsByTagName('*'), results = [];
				for (var i = 0, node; node = nodes[i]; i++)
					if (node.tagName !== "!") // Filter out comment nodes.
						results.push(node);
				return results;
			}

			Element.Methods.down = function (element, expression, index) {
				element = $(element);
				if (arguments.length == 1) return element.firstDescendant();
				return Object.isNumber(expression) ? _descendants(element)[expression] :
          Element.select(element, expression)[index || 0];
			}
		})();
	}

}

else if (Prototype.Browser.Gecko && /rv:1\.8\.0/.test(navigator.userAgent)) {
	Element.Methods.setOpacity = function (element, value) {
		element = $(element);
		element.style.opacity = (value == 1) ? 0.999999 :
      (value === '') ? '' : (value < 0.00001) ? 0 : value;
		return element;
	};
}

else if (Prototype.Browser.WebKit) {
	Element.Methods.setOpacity = function (element, value) {
		element = $(element);
		element.style.opacity = (value == 1 || value === '') ? '' :
      (value < 0.00001) ? 0 : value;

		if (value == 1)
			if (element.tagName.toUpperCase() == 'IMG' && element.width) {
				element.width++; element.width--;
			} else try {
				var n = document.createTextNode(' ');
				element.appendChild(n);
				element.removeChild(n);
			} catch (e) { }

		return element;
	};
}

if ('outerHTML' in document.documentElement) {
	Element.Methods.replace = function (element, content) {
		element = $(element);

		if (content && content.toElement) content = content.toElement();
		if (Object.isElement(content)) {
			element.parentNode.replaceChild(content, element);
			return element;
		}

		content = Object.toHTML(content);
		var parent = element.parentNode, tagName = parent.tagName.toUpperCase();

		if (Element._insertionTranslations.tags[tagName]) {
			var nextSibling = element.next(),
          fragments = Element._getContentFromAnonymousElement(tagName, content.stripScripts());
			parent.removeChild(element);
			if (nextSibling)
				fragments.each(function (node) { parent.insertBefore(node, nextSibling) });
			else
				fragments.each(function (node) { parent.appendChild(node) });
		}
		else element.outerHTML = content.stripScripts();

		content.evalScripts.bind(content).defer();
		return element;
	};
}

Element._returnOffset = function (l, t) {
	var result = [l, t];
	result.left = l;
	result.top = t;
	return result;
};

Element._getContentFromAnonymousElement = function (tagName, html, force) {
	var div = new Element('div'),
      t = Element._insertionTranslations.tags[tagName];

	var workaround = false;
	if (t) workaround = true;
	else if (force) {
		workaround = true;
		t = ['', '', 0];
	}

	if (workaround) {
		div.innerHTML = '&nbsp;' + t[0] + html + t[1];
		div.removeChild(div.firstChild);
		for (var i = t[2]; i--; ) {
			div = div.firstChild;
		}
	}
	else {
		div.innerHTML = html;
	}
	return $A(div.childNodes);
};

Element._insertionTranslations = {
	before: function (element, node) {
		element.parentNode.insertBefore(node, element);
	},
	top: function (element, node) {
		element.insertBefore(node, element.firstChild);
	},
	bottom: function (element, node) {
		element.appendChild(node);
	},
	after: function (element, node) {
		element.parentNode.insertBefore(node, element.nextSibling);
	},
	tags: {
		TABLE: ['<table>', '</table>', 1],
		TBODY: ['<table><tbody>', '</tbody></table>', 2],
		TR: ['<table><tbody><tr>', '</tr></tbody></table>', 3],
		TD: ['<table><tbody><tr><td>', '</td></tr></tbody></table>', 4],
		SELECT: ['<select>', '</select>', 1]
	}
};

(function () {
	var tags = Element._insertionTranslations.tags;
	Object.extend(tags, {
		THEAD: tags.TBODY,
		TFOOT: tags.TBODY,
		TH: tags.TD
	});
})();

Element.Methods.Simulated = {
	hasAttribute: function (element, attribute) {
		attribute = Element._attributeTranslations.has[attribute] || attribute;
		var node = $(element).getAttributeNode(attribute);
		return !!(node && node.specified);
	}
};

Element.Methods.ByTag = {};

Object.extend(Element, Element.Methods);

(function (div) {

	if (!Prototype.BrowserFeatures.ElementExtensions && div['__proto__']) {
		window.HTMLElement = {};
		window.HTMLElement.prototype = div['__proto__'];
		Prototype.BrowserFeatures.ElementExtensions = true;
	}

	div = null;

})(document.createElement('div'));

Element.extend = (function () {

	function checkDeficiency(tagName) {
		if (typeof window.Element != 'undefined') {
			var proto = window.Element.prototype;
			if (proto) {
				var id = '_' + (Math.random() + '').slice(2),
            el = document.createElement(tagName);
				proto[id] = 'x';
				var isBuggy = (el[id] !== 'x');
				delete proto[id];
				el = null;
				return isBuggy;
			}
		}
		return false;
	}

	function extendElementWith(element, methods) {
		for (var property in methods) {
			var value = methods[property];
			if (Object.isFunction(value) && !(property in element))
				element[property] = value.methodize();
		}
	}

	var HTMLOBJECTELEMENT_PROTOTYPE_BUGGY = checkDeficiency('object');

	if (Prototype.BrowserFeatures.SpecificElementExtensions) {
		if (HTMLOBJECTELEMENT_PROTOTYPE_BUGGY) {
			return function (element) {
				if (element && typeof element._extendedByPrototype == 'undefined') {
					var t = element.tagName;
					if (t && (/^(?:object|applet|embed)$/i.test(t))) {
						extendElementWith(element, Element.Methods);
						extendElementWith(element, Element.Methods.Simulated);
						extendElementWith(element, Element.Methods.ByTag[t.toUpperCase()]);
					}
				}
				return element;
			}
		}
		return Prototype.K;
	}

	var Methods = {}, ByTag = Element.Methods.ByTag;

	var extend = Object.extend(function (element) {
		if (!element || typeof element._extendedByPrototype != 'undefined' ||
        element.nodeType != 1 || element == window) return element;

		var methods = Object.clone(Methods),
        tagName = element.tagName.toUpperCase();

		if (ByTag[tagName]) Object.extend(methods, ByTag[tagName]);

		extendElementWith(element, methods);

		element._extendedByPrototype = Prototype.emptyFunction;
		return element;

	}, {
		refresh: function () {
			if (!Prototype.BrowserFeatures.ElementExtensions) {
				Object.extend(Methods, Element.Methods);
				Object.extend(Methods, Element.Methods.Simulated);
			}
		}
	});

	extend.refresh();
	return extend;
})();

if (document.documentElement.hasAttribute) {
	Element.hasAttribute = function (element, attribute) {
		return element.hasAttribute(attribute);
	};
}
else {
	Element.hasAttribute = Element.Methods.Simulated.hasAttribute;
}

Element.addMethods = function (methods) {
	var F = Prototype.BrowserFeatures, T = Element.Methods.ByTag;

	if (!methods) {
		Object.extend(Form, Form.Methods);
		Object.extend(Form.Element, Form.Element.Methods);
		Object.extend(Element.Methods.ByTag, {
			"FORM": Object.clone(Form.Methods),
			"INPUT": Object.clone(Form.Element.Methods),
			"SELECT": Object.clone(Form.Element.Methods),
			"TEXTAREA": Object.clone(Form.Element.Methods),
			"BUTTON": Object.clone(Form.Element.Methods)
		});
	}

	if (arguments.length == 2) {
		var tagName = methods;
		methods = arguments[1];
	}

	if (!tagName) Object.extend(Element.Methods, methods || {});
	else {
		if (Object.isArray(tagName)) tagName.each(extend);
		else extend(tagName);
	}

	function extend(tagName) {
		tagName = tagName.toUpperCase();
		if (!Element.Methods.ByTag[tagName])
			Element.Methods.ByTag[tagName] = {};
		Object.extend(Element.Methods.ByTag[tagName], methods);
	}

	function copy(methods, destination, onlyIfAbsent) {
		onlyIfAbsent = onlyIfAbsent || false;
		for (var property in methods) {
			var value = methods[property];
			if (!Object.isFunction(value)) continue;
			if (!onlyIfAbsent || !(property in destination))
				destination[property] = value.methodize();
		}
	}

	function findDOMClass(tagName) {
		var klass;
		var trans = {
			"OPTGROUP": "OptGroup", "TEXTAREA": "TextArea", "P": "Paragraph",
			"FIELDSET": "FieldSet", "UL": "UList", "OL": "OList", "DL": "DList",
			"DIR": "Directory", "H1": "Heading", "H2": "Heading", "H3": "Heading",
			"H4": "Heading", "H5": "Heading", "H6": "Heading", "Q": "Quote",
			"INS": "Mod", "DEL": "Mod", "A": "Anchor", "IMG": "Image", "CAPTION":
      "TableCaption", "COL": "TableCol", "COLGROUP": "TableCol", "THEAD":
      "TableSection", "TFOOT": "TableSection", "TBODY": "TableSection", "TR":
      "TableRow", "TH": "TableCell", "TD": "TableCell", "FRAMESET":
      "FrameSet", "IFRAME": "IFrame"
		};
		if (trans[tagName]) klass = 'HTML' + trans[tagName] + 'Element';
		if (window[klass]) return window[klass];
		klass = 'HTML' + tagName + 'Element';
		if (window[klass]) return window[klass];
		klass = 'HTML' + tagName.capitalize() + 'Element';
		if (window[klass]) return window[klass];

		var element = document.createElement(tagName),
        proto = element['__proto__'] || element.constructor.prototype;

		element = null;
		return proto;
	}

	var elementPrototype = window.HTMLElement ? HTMLElement.prototype :
   Element.prototype;

	if (F.ElementExtensions) {
		copy(Element.Methods, elementPrototype);
		copy(Element.Methods.Simulated, elementPrototype, true);
	}

	if (F.SpecificElementExtensions) {
		for (var tag in Element.Methods.ByTag) {
			var klass = findDOMClass(tag);
			if (Object.isUndefined(klass)) continue;
			copy(T[tag], klass.prototype);
		}
	}

	Object.extend(Element, Element.Methods);
	delete Element.ByTag;

	if (Element.extend.refresh) Element.extend.refresh();
	Element.cache = {};
};


document.viewport = {

	getDimensions: function () {
		return { width: this.getWidth(), height: this.getHeight() };
	},

	getScrollOffsets: function () {
		return Element._returnOffset(
      window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
      window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
	}
};

(function (viewport) {
	var B = Prototype.Browser, doc = document, element, property = {};

	function getRootElement() {
		if (B.WebKit && !doc.evaluate)
			return document;

		if (B.Opera && window.parseFloat(window.opera.version()) < 9.5)
			return document.body;

		return document.documentElement;
	}

	function define(D) {
		if (!element) element = getRootElement();

		property[D] = 'client' + D;

		viewport['get' + D] = function () { return element[property[D]] };
		return viewport['get' + D]();
	}

	viewport.getWidth = define.curry('Width');

	viewport.getHeight = define.curry('Height');
})(document.viewport);


Element.Storage = {
	UID: 1
};

Element.addMethods({
	getStorage: function (element) {
		if (!(element = $(element))) return;

		var uid;
		if (element === window) {
			uid = 0;
		} else {
			if (typeof element._prototypeUID === "undefined")
				element._prototypeUID = Element.Storage.UID++;
			uid = element._prototypeUID;
		}

		if (!Element.Storage[uid])
			Element.Storage[uid] = $H();

		return Element.Storage[uid];
	},

	store: function (element, key, value) {
		if (!(element = $(element))) return;

		if (arguments.length === 2) {
			Element.getStorage(element).update(key);
		} else {
			Element.getStorage(element).set(key, value);
		}

		return element;
	},

	retrieve: function (element, key, defaultValue) {
		if (!(element = $(element))) return;
		var hash = Element.getStorage(element), value = hash.get(key);

		if (Object.isUndefined(value)) {
			hash.set(key, defaultValue);
			value = defaultValue;
		}

		return value;
	},

	clone: function (element, deep) {
		if (!(element = $(element))) return;
		var clone = element.cloneNode(deep);
		clone._prototypeUID = void 0;
		if (deep) {
			var descendants = Element.select(clone, '*'),
          i = descendants.length;
			while (i--) {
				descendants[i]._prototypeUID = void 0;
			}
		}
		return Element.extend(clone);
	},

	purge: function (element) {
		if (!(element = $(element))) return;
		var purgeElement = Element._purgeElement;

		purgeElement(element);

		var descendants = element.getElementsByTagName('*'),
     i = descendants.length;

		while (i--) purgeElement(descendants[i]);

		return null;
	}
});

(function () {

	function toDecimal(pctString) {
		var match = pctString.match(/^(\d+)%?$/i);
		if (!match) return null;
		return (Number(match[1]) / 100);
	}

	function getPixelValue(value, property, context) {
		var element = null;
		if (Object.isElement(value)) {
			element = value;
			value = element.getStyle(property);
		}

		if (value === null) {
			return null;
		}

		if ((/^(?:-)?\d+(\.\d+)?(px)?$/i).test(value)) {
			return window.parseFloat(value);
		}

		var isPercentage = value.include('%'), isViewport = (context === document.viewport);

		if (/\d/.test(value) && element && element.runtimeStyle && !(isPercentage && isViewport)) {
			var style = element.style.left, rStyle = element.runtimeStyle.left;
			element.runtimeStyle.left = element.currentStyle.left;
			element.style.left = value || 0;
			value = element.style.pixelLeft;
			element.style.left = style;
			element.runtimeStyle.left = rStyle;

			return value;
		}

		if (element && isPercentage) {
			context = context || element.parentNode;
			var decimal = toDecimal(value);
			var whole = null;
			var position = element.getStyle('position');

			var isHorizontal = property.include('left') || property.include('right') ||
       property.include('width');

			var isVertical = property.include('top') || property.include('bottom') ||
        property.include('height');

			if (context === document.viewport) {
				if (isHorizontal) {
					whole = document.viewport.getWidth();
				} else if (isVertical) {
					whole = document.viewport.getHeight();
				}
			} else {
				if (isHorizontal) {
					whole = $(context).measure('width');
				} else if (isVertical) {
					whole = $(context).measure('height');
				}
			}

			return (whole === null) ? 0 : whole * decimal;
		}

		return 0;
	}

	function toCSSPixels(number) {
		if (Object.isString(number) && number.endsWith('px')) {
			return number;
		}
		return number + 'px';
	}

	function isDisplayed(element) {
		var originalElement = element;
		while (element && element.parentNode) {
			var display = element.getStyle('display');
			if (display === 'none') {
				return false;
			}
			element = $(element.parentNode);
		}
		return true;
	}

	var hasLayout = Prototype.K;
	if ('currentStyle' in document.documentElement) {
		hasLayout = function (element) {
			if (!element.currentStyle.hasLayout) {
				element.style.zoom = 1;
			}
			return element;
		};
	}

	function cssNameFor(key) {
		if (key.include('border')) key = key + '-width';
		return key.camelize();
	}

	Element.Layout = Class.create(Hash, {
		initialize: function ($super, element, preCompute) {
			$super();
			this.element = $(element);

			Element.Layout.PROPERTIES.each(function (property) {
				this._set(property, null);
			}, this);

			if (preCompute) {
				this._preComputing = true;
				this._begin();
				Element.Layout.PROPERTIES.each(this._compute, this);
				this._end();
				this._preComputing = false;
			}
		},

		_set: function (property, value) {
			return Hash.prototype.set.call(this, property, value);
		},

		set: function (property, value) {
			throw "Properties of Element.Layout are read-only.";
		},

		get: function ($super, property) {
			var value = $super(property);
			return value === null ? this._compute(property) : value;
		},

		_begin: function () {
			if (this._prepared) return;

			var element = this.element;
			if (isDisplayed(element)) {
				this._prepared = true;
				return;
			}

			var originalStyles = {
				position: element.style.position || '',
				width: element.style.width || '',
				visibility: element.style.visibility || '',
				display: element.style.display || ''
			};

			element.store('prototype_original_styles', originalStyles);

			var position = element.getStyle('position'),
       width = element.getStyle('width');

			if (width === "0px" || width === null) {
				element.style.display = 'block';
				width = element.getStyle('width');
			}

			var context = (position === 'fixed') ? document.viewport :
       element.parentNode;

			element.setStyle({
				position: 'absolute',
				visibility: 'hidden',
				display: 'block'
			});

			var positionedWidth = element.getStyle('width');

			var newWidth;
			if (width && (positionedWidth === width)) {
				newWidth = getPixelValue(element, 'width', context);
			} else if (position === 'absolute' || position === 'fixed') {
				newWidth = getPixelValue(element, 'width', context);
			} else {
				var parent = element.parentNode, pLayout = $(parent).getLayout();

				newWidth = pLayout.get('width') -
         this.get('margin-left') -
         this.get('border-left') -
         this.get('padding-left') -
         this.get('padding-right') -
         this.get('border-right') -
         this.get('margin-right');
			}

			element.setStyle({ width: newWidth + 'px' });

			this._prepared = true;
		},

		_end: function () {
			var element = this.element;
			var originalStyles = element.retrieve('prototype_original_styles');
			element.store('prototype_original_styles', null);
			element.setStyle(originalStyles);
			this._prepared = false;
		},

		_compute: function (property) {
			var COMPUTATIONS = Element.Layout.COMPUTATIONS;
			if (!(property in COMPUTATIONS)) {
				throw "Property not found.";
			}

			return this._set(property, COMPUTATIONS[property].call(this, this.element));
		},

		toObject: function () {
			var args = $A(arguments);
			var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
       args.join(' ').split(' ');
			var obj = {};
			keys.each(function (key) {
				if (!Element.Layout.PROPERTIES.include(key)) return;
				var value = this.get(key);
				if (value != null) obj[key] = value;
			}, this);
			return obj;
		},

		toHash: function () {
			var obj = this.toObject.apply(this, arguments);
			return new Hash(obj);
		},

		toCSS: function () {
			var args = $A(arguments);
			var keys = (args.length === 0) ? Element.Layout.PROPERTIES :
       args.join(' ').split(' ');
			var css = {};

			keys.each(function (key) {
				if (!Element.Layout.PROPERTIES.include(key)) return;
				if (Element.Layout.COMPOSITE_PROPERTIES.include(key)) return;

				var value = this.get(key);
				if (value != null) css[cssNameFor(key)] = value + 'px';
			}, this);
			return css;
		},

		inspect: function () {
			return "#<Element.Layout>";
		}
	});

	Object.extend(Element.Layout, {
		PROPERTIES: $w('height width top left right bottom border-left border-right border-top border-bottom padding-left padding-right padding-top padding-bottom margin-top margin-bottom margin-left margin-right padding-box-width padding-box-height border-box-width border-box-height margin-box-width margin-box-height'),

		COMPOSITE_PROPERTIES: $w('padding-box-width padding-box-height margin-box-width margin-box-height border-box-width border-box-height'),

		COMPUTATIONS: {
			'height': function (element) {
				if (!this._preComputing) this._begin();

				var bHeight = this.get('border-box-height');
				if (bHeight <= 0) {
					if (!this._preComputing) this._end();
					return 0;
				}

				var bTop = this.get('border-top'),
         bBottom = this.get('border-bottom');

				var pTop = this.get('padding-top'),
         pBottom = this.get('padding-bottom');

				if (!this._preComputing) this._end();

				return bHeight - bTop - bBottom - pTop - pBottom;
			},

			'width': function (element) {
				if (!this._preComputing) this._begin();

				var bWidth = this.get('border-box-width');
				if (bWidth <= 0) {
					if (!this._preComputing) this._end();
					return 0;
				}

				var bLeft = this.get('border-left'),
         bRight = this.get('border-right');

				var pLeft = this.get('padding-left'),
         pRight = this.get('padding-right');

				if (!this._preComputing) this._end();

				return bWidth - bLeft - bRight - pLeft - pRight;
			},

			'padding-box-height': function (element) {
				var height = this.get('height'),
         pTop = this.get('padding-top'),
         pBottom = this.get('padding-bottom');

				return height + pTop + pBottom;
			},

			'padding-box-width': function (element) {
				var width = this.get('width'),
         pLeft = this.get('padding-left'),
         pRight = this.get('padding-right');

				return width + pLeft + pRight;
			},

			'border-box-height': function (element) {
				if (!this._preComputing) this._begin();
				var height = element.offsetHeight;
				if (!this._preComputing) this._end();
				return height;
			},

			'border-box-width': function (element) {
				if (!this._preComputing) this._begin();
				var width = element.offsetWidth;
				if (!this._preComputing) this._end();
				return width;
			},

			'margin-box-height': function (element) {
				var bHeight = this.get('border-box-height'),
         mTop = this.get('margin-top'),
         mBottom = this.get('margin-bottom');

				if (bHeight <= 0) return 0;

				return bHeight + mTop + mBottom;
			},

			'margin-box-width': function (element) {
				var bWidth = this.get('border-box-width'),
         mLeft = this.get('margin-left'),
         mRight = this.get('margin-right');

				if (bWidth <= 0) return 0;

				return bWidth + mLeft + mRight;
			},

			'top': function (element) {
				var offset = element.positionedOffset();
				return offset.top;
			},

			'bottom': function (element) {
				var offset = element.positionedOffset(),
         parent = element.getOffsetParent(),
         pHeight = parent.measure('height');

				var mHeight = this.get('border-box-height');

				return pHeight - mHeight - offset.top;
			},

			'left': function (element) {
				var offset = element.positionedOffset();
				return offset.left;
			},

			'right': function (element) {
				var offset = element.positionedOffset(),
         parent = element.getOffsetParent(),
         pWidth = parent.measure('width');

				var mWidth = this.get('border-box-width');

				return pWidth - mWidth - offset.left;
			},

			'padding-top': function (element) {
				return getPixelValue(element, 'paddingTop');
			},

			'padding-bottom': function (element) {
				return getPixelValue(element, 'paddingBottom');
			},

			'padding-left': function (element) {
				return getPixelValue(element, 'paddingLeft');
			},

			'padding-right': function (element) {
				return getPixelValue(element, 'paddingRight');
			},

			'border-top': function (element) {
				return getPixelValue(element, 'borderTopWidth');
			},

			'border-bottom': function (element) {
				return getPixelValue(element, 'borderBottomWidth');
			},

			'border-left': function (element) {
				return getPixelValue(element, 'borderLeftWidth');
			},

			'border-right': function (element) {
				return getPixelValue(element, 'borderRightWidth');
			},

			'margin-top': function (element) {
				return getPixelValue(element, 'marginTop');
			},

			'margin-bottom': function (element) {
				return getPixelValue(element, 'marginBottom');
			},

			'margin-left': function (element) {
				return getPixelValue(element, 'marginLeft');
			},

			'margin-right': function (element) {
				return getPixelValue(element, 'marginRight');
			}
		}
	});

	if ('getBoundingClientRect' in document.documentElement) {
		Object.extend(Element.Layout.COMPUTATIONS, {
			'right': function (element) {
				var parent = hasLayout(element.getOffsetParent());
				var rect = element.getBoundingClientRect(),
         pRect = parent.getBoundingClientRect();

				return (pRect.right - rect.right).round();
			},

			'bottom': function (element) {
				var parent = hasLayout(element.getOffsetParent());
				var rect = element.getBoundingClientRect(),
         pRect = parent.getBoundingClientRect();

				return (pRect.bottom - rect.bottom).round();
			}
		});
	}

	Element.Offset = Class.create({
		initialize: function (left, top) {
			this.left = left.round();
			this.top = top.round();

			this[0] = this.left;
			this[1] = this.top;
		},

		relativeTo: function (offset) {
			return new Element.Offset(
        this.left - offset.left,
        this.top - offset.top
      );
		},

		inspect: function () {
			return "#<Element.Offset left: #{left} top: #{top}>".interpolate(this);
		},

		toString: function () {
			return "[#{left}, #{top}]".interpolate(this);
		},

		toArray: function () {
			return [this.left, this.top];
		}
	});

	function getLayout(element, preCompute) {
		return new Element.Layout(element, preCompute);
	}

	function measure(element, property) {
		return $(element).getLayout().get(property);
	}

	function getDimensions(element) {
		element = $(element);
		var display = Element.getStyle(element, 'display');

		if (display && display !== 'none') {
			return { width: element.offsetWidth, height: element.offsetHeight };
		}

		var style = element.style;
		var originalStyles = {
			visibility: style.visibility,
			position: style.position,
			display: style.display
		};

		var newStyles = {
			visibility: 'hidden',
			display: 'block'
		};

		if (originalStyles.position !== 'fixed')
			newStyles.position = 'absolute';

		Element.setStyle(element, newStyles);

		var dimensions = {
			width: element.offsetWidth,
			height: element.offsetHeight
		};

		Element.setStyle(element, originalStyles);

		return dimensions;
	}

	function getOffsetParent(element) {
		element = $(element);

		if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
			return $(document.body);

		var isInline = (Element.getStyle(element, 'display') === 'inline');
		if (!isInline && element.offsetParent) return $(element.offsetParent);

		while ((element = element.parentNode) && element !== document.body) {
			if (Element.getStyle(element, 'position') !== 'static') {
				return isHtml(element) ? $(document.body) : $(element);
			}
		}

		return $(document.body);
	}


	function cumulativeOffset(element) {
		element = $(element);
		var valueT = 0, valueL = 0;
		if (element.parentNode) {
			do {
				valueT += element.offsetTop || 0;
				valueL += element.offsetLeft || 0;
				element = element.offsetParent;
			} while (element);
		}
		return new Element.Offset(valueL, valueT);
	}

	function positionedOffset(element) {
		element = $(element);

		var layout = element.getLayout();

		var valueT = 0, valueL = 0;
		do {
			valueT += element.offsetTop || 0;
			valueL += element.offsetLeft || 0;
			element = element.offsetParent;
			if (element) {
				if (isBody(element)) break;
				var p = Element.getStyle(element, 'position');
				if (p !== 'static') break;
			}
		} while (element);

		valueL -= layout.get('margin-top');
		valueT -= layout.get('margin-left');

		return new Element.Offset(valueL, valueT);
	}

	function cumulativeScrollOffset(element) {
		var valueT = 0, valueL = 0;
		do {
			valueT += element.scrollTop || 0;
			valueL += element.scrollLeft || 0;
			element = element.parentNode;
		} while (element);
		return new Element.Offset(valueL, valueT);
	}

	function viewportOffset(forElement) {
		element = $(element);
		var valueT = 0, valueL = 0, docBody = document.body;

		var element = forElement;
		do {
			valueT += element.offsetTop || 0;
			valueL += element.offsetLeft || 0;
			if (element.offsetParent == docBody &&
        Element.getStyle(element, 'position') == 'absolute') break;
		} while (element = element.offsetParent);

		element = forElement;
		do {
			if (element != docBody) {
				valueT -= element.scrollTop || 0;
				valueL -= element.scrollLeft || 0;
			}
		} while (element = element.parentNode);
		return new Element.Offset(valueL, valueT);
	}

	function absolutize(element) {
		element = $(element);

		if (Element.getStyle(element, 'position') === 'absolute') {
			return element;
		}

		var offsetParent = getOffsetParent(element);
		var eOffset = element.viewportOffset(),
     pOffset = offsetParent.viewportOffset();

		var offset = eOffset.relativeTo(pOffset);
		var layout = element.getLayout();

		element.store('prototype_absolutize_original_styles', {
			left: element.getStyle('left'),
			top: element.getStyle('top'),
			width: element.getStyle('width'),
			height: element.getStyle('height')
		});

		element.setStyle({
			position: 'absolute',
			top: offset.top + 'px',
			left: offset.left + 'px',
			width: layout.get('width') + 'px',
			height: layout.get('height') + 'px'
		});

		return element;
	}

	function relativize(element) {
		element = $(element);
		if (Element.getStyle(element, 'position') === 'relative') {
			return element;
		}

		var originalStyles =
     element.retrieve('prototype_absolutize_original_styles');

		if (originalStyles) element.setStyle(originalStyles);
		return element;
	}

	if (Prototype.Browser.IE) {
		getOffsetParent = getOffsetParent.wrap(
      function (proceed, element) {
      	element = $(element);

      	if (isDocument(element) || isDetached(element) || isBody(element) || isHtml(element))
      		return $(document.body);

      	var position = element.getStyle('position');
      	if (position !== 'static') return proceed(element);

      	element.setStyle({ position: 'relative' });
      	var value = proceed(element);
      	element.setStyle({ position: position });
      	return value;
      }
    );

		positionedOffset = positionedOffset.wrap(function (proceed, element) {
			element = $(element);
			if (!element.parentNode) return new Element.Offset(0, 0);
			var position = element.getStyle('position');
			if (position !== 'static') return proceed(element);

			var offsetParent = element.getOffsetParent();
			if (offsetParent && offsetParent.getStyle('position') === 'fixed')
				hasLayout(offsetParent);

			element.setStyle({ position: 'relative' });
			var value = proceed(element);
			element.setStyle({ position: position });
			return value;
		});
	} else if (Prototype.Browser.Webkit) {
		cumulativeOffset = function (element) {
			element = $(element);
			var valueT = 0, valueL = 0;
			do {
				valueT += element.offsetTop || 0;
				valueL += element.offsetLeft || 0;
				if (element.offsetParent == document.body)
					if (Element.getStyle(element, 'position') == 'absolute') break;

				element = element.offsetParent;
			} while (element);

			return new Element.Offset(valueL, valueT);
		};
	}


	Element.addMethods({
		getLayout: getLayout,
		measure: measure,
		getDimensions: getDimensions,
		getOffsetParent: getOffsetParent,
		cumulativeOffset: cumulativeOffset,
		positionedOffset: positionedOffset,
		cumulativeScrollOffset: cumulativeScrollOffset,
		viewportOffset: viewportOffset,
		absolutize: absolutize,
		relativize: relativize
	});

	function isBody(element) {
		return element.nodeName.toUpperCase() === 'BODY';
	}

	function isHtml(element) {
		return element.nodeName.toUpperCase() === 'HTML';
	}

	function isDocument(element) {
		return element.nodeType === Node.DOCUMENT_NODE;
	}

	function isDetached(element) {
		return element !== document.body &&
     !Element.descendantOf(element, document.body);
	}

	if ('getBoundingClientRect' in document.documentElement) {
		Element.addMethods({
			viewportOffset: function (element) {
				element = $(element);
				if (isDetached(element)) return new Element.Offset(0, 0);

				var rect = element.getBoundingClientRect(),
         docEl = document.documentElement;
				return new Element.Offset(rect.left - docEl.clientLeft,
         rect.top - docEl.clientTop);
			}
		});
	}
})();
window.$$ = function () {
	var expression = $A(arguments).join(', ');
	return Prototype.Selector.select(expression, document);
};

Prototype.Selector = (function () {

	function select() {
		throw new Error('Method "Prototype.Selector.select" must be defined.');
	}

	function match() {
		throw new Error('Method "Prototype.Selector.match" must be defined.');
	}

	function find(elements, expression, index) {
		index = index || 0;
		var match = Prototype.Selector.match, length = elements.length, matchIndex = 0, i;

		for (i = 0; i < length; i++) {
			if (match(elements[i], expression) && index == matchIndex++) {
				return Element.extend(elements[i]);
			}
		}
	}

	function extendElements(elements) {
		for (var i = 0, length = elements.length; i < length; i++) {
			Element.extend(elements[i]);
		}
		return elements;
	}


	var K = Prototype.K;

	return {
		select: select,
		match: match,
		find: find,
		extendElements: (Element.extend === K) ? K : extendElements,
		extendElement: Element.extend
	};
})();
Prototype._original_property = window.Sizzle;
/*!
* Sizzle CSS Selector Engine - v1.0
*  Copyright 2009, The Dojo Foundation
*  Released under the MIT, BSD, and GPL Licenses.
*  More information: http://sizzlejs.com/
*/
(function () {

	var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^[\]]*\]|['"][^'"]*['"]|[^[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,
	done = 0,
	toString = Object.prototype.toString,
	hasDuplicate = false,
	baseHasDuplicate = true;

	[0, 0].sort(function () {
		baseHasDuplicate = false;
		return 0;
	});

	var Sizzle = function (selector, context, results, seed) {
		results = results || [];
		var origContext = context = context || document;

		if (context.nodeType !== 1 && context.nodeType !== 9) {
			return [];
		}

		if (!selector || typeof selector !== "string") {
			return results;
		}

		var parts = [], m, set, checkSet, check, mode, extra, prune = true, contextXML = isXML(context),
		soFar = selector;

		while ((chunker.exec(""), m = chunker.exec(soFar)) !== null) {
			soFar = m[3];

			parts.push(m[1]);

			if (m[2]) {
				extra = m[3];
				break;
			}
		}

		if (parts.length > 1 && origPOS.exec(selector)) {
			if (parts.length === 2 && Expr.relative[parts[0]]) {
				set = posProcess(parts[0] + parts[1], context);
			} else {
				set = Expr.relative[parts[0]] ?
				[context] :
				Sizzle(parts.shift(), context);

				while (parts.length) {
					selector = parts.shift();

					if (Expr.relative[selector])
						selector += parts.shift();

					set = posProcess(selector, set);
				}
			}
		} else {
			if (!seed && parts.length > 1 && context.nodeType === 9 && !contextXML &&
				Expr.match.ID.test(parts[0]) && !Expr.match.ID.test(parts[parts.length - 1])) {
				var ret = Sizzle.find(parts.shift(), context, contextXML);
				context = ret.expr ? Sizzle.filter(ret.expr, ret.set)[0] : ret.set[0];
			}

			if (context) {
				var ret = seed ?
				{ expr: parts.pop(), set: makeArray(seed)} :
				Sizzle.find(parts.pop(), parts.length === 1 && (parts[0] === "~" || parts[0] === "+") && context.parentNode ? context.parentNode : context, contextXML);
				set = ret.expr ? Sizzle.filter(ret.expr, ret.set) : ret.set;

				if (parts.length > 0) {
					checkSet = makeArray(set);
				} else {
					prune = false;
				}

				while (parts.length) {
					var cur = parts.pop(), pop = cur;

					if (!Expr.relative[cur]) {
						cur = "";
					} else {
						pop = parts.pop();
					}

					if (pop == null) {
						pop = context;
					}

					Expr.relative[cur](checkSet, pop, contextXML);
				}
			} else {
				checkSet = parts = [];
			}
		}

		if (!checkSet) {
			checkSet = set;
		}

		if (!checkSet) {
			throw "Syntax error, unrecognized expression: " + (cur || selector);
		}

		if (toString.call(checkSet) === "[object Array]") {
			if (!prune) {
				results.push.apply(results, checkSet);
			} else if (context && context.nodeType === 1) {
				for (var i = 0; checkSet[i] != null; i++) {
					if (checkSet[i] && (checkSet[i] === true || checkSet[i].nodeType === 1 && contains(context, checkSet[i]))) {
						results.push(set[i]);
					}
				}
			} else {
				for (var i = 0; checkSet[i] != null; i++) {
					if (checkSet[i] && checkSet[i].nodeType === 1) {
						results.push(set[i]);
					}
				}
			}
		} else {
			makeArray(checkSet, results);
		}

		if (extra) {
			Sizzle(extra, origContext, results, seed);
			Sizzle.uniqueSort(results);
		}

		return results;
	};

	Sizzle.uniqueSort = function (results) {
		if (sortOrder) {
			hasDuplicate = baseHasDuplicate;
			results.sort(sortOrder);

			if (hasDuplicate) {
				for (var i = 1; i < results.length; i++) {
					if (results[i] === results[i - 1]) {
						results.splice(i--, 1);
					}
				}
			}
		}

		return results;
	};

	Sizzle.matches = function (expr, set) {
		return Sizzle(expr, null, null, set);
	};

	Sizzle.find = function (expr, context, isXML) {
		var set, match;

		if (!expr) {
			return [];
		}

		for (var i = 0, l = Expr.order.length; i < l; i++) {
			var type = Expr.order[i], match;

			if ((match = Expr.leftMatch[type].exec(expr))) {
				var left = match[1];
				match.splice(1, 1);

				if (left.substr(left.length - 1) !== "\\") {
					match[1] = (match[1] || "").replace(/\\/g, "");
					set = Expr.find[type](match, context, isXML);
					if (set != null) {
						expr = expr.replace(Expr.match[type], "");
						break;
					}
				}
			}
		}

		if (!set) {
			set = context.getElementsByTagName("*");
		}

		return { set: set, expr: expr };
	};

	Sizzle.filter = function (expr, set, inplace, not) {
		var old = expr, result = [], curLoop = set, match, anyFound,
		isXMLFilter = set && set[0] && isXML(set[0]);

		while (expr && set.length) {
			for (var type in Expr.filter) {
				if ((match = Expr.match[type].exec(expr)) != null) {
					var filter = Expr.filter[type], found, item;
					anyFound = false;

					if (curLoop == result) {
						result = [];
					}

					if (Expr.preFilter[type]) {
						match = Expr.preFilter[type](match, curLoop, inplace, result, not, isXMLFilter);

						if (!match) {
							anyFound = found = true;
						} else if (match === true) {
							continue;
						}
					}

					if (match) {
						for (var i = 0; (item = curLoop[i]) != null; i++) {
							if (item) {
								found = filter(item, match, i, curLoop);
								var pass = not ^ !!found;

								if (inplace && found != null) {
									if (pass) {
										anyFound = true;
									} else {
										curLoop[i] = false;
									}
								} else if (pass) {
									result.push(item);
									anyFound = true;
								}
							}
						}
					}

					if (found !== undefined) {
						if (!inplace) {
							curLoop = result;
						}

						expr = expr.replace(Expr.match[type], "");

						if (!anyFound) {
							return [];
						}

						break;
					}
				}
			}

			if (expr == old) {
				if (anyFound == null) {
					throw "Syntax error, unrecognized expression: " + expr;
				} else {
					break;
				}
			}

			old = expr;
		}

		return curLoop;
	};

	var Expr = Sizzle.selectors = {
		order: ["ID", "NAME", "TAG"],
		match: {
			ID: /#((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
			CLASS: /\.((?:[\w\u00c0-\uFFFF-]|\\.)+)/,
			NAME: /\[name=['"]*((?:[\w\u00c0-\uFFFF-]|\\.)+)['"]*\]/,
			ATTR: /\[\s*((?:[\w\u00c0-\uFFFF-]|\\.)+)\s*(?:(\S?=)\s*(['"]*)(.*?)\3|)\s*\]/,
			TAG: /^((?:[\w\u00c0-\uFFFF\*-]|\\.)+)/,
			CHILD: /:(only|nth|last|first)-child(?:\((even|odd|[\dn+-]*)\))?/,
			POS: /:(nth|eq|gt|lt|first|last|even|odd)(?:\((\d*)\))?(?=[^-]|$)/,
			PSEUDO: /:((?:[\w\u00c0-\uFFFF-]|\\.)+)(?:\((['"]*)((?:\([^\)]+\)|[^\2\(\)]*)+)\2\))?/
		},
		leftMatch: {},
		attrMap: {
			"class": "className",
			"for": "htmlFor"
		},
		attrHandle: {
			href: function (elem) {
				return elem.getAttribute("href");
			}
		},
		relative: {
			"+": function (checkSet, part, isXML) {
				var isPartStr = typeof part === "string",
				isTag = isPartStr && !/\W/.test(part),
				isPartStrNotTag = isPartStr && !isTag;

				if (isTag && !isXML) {
					part = part.toUpperCase();
				}

				for (var i = 0, l = checkSet.length, elem; i < l; i++) {
					if ((elem = checkSet[i])) {
						while ((elem = elem.previousSibling) && elem.nodeType !== 1) { }

						checkSet[i] = isPartStrNotTag || elem && elem.nodeName === part ?
						elem || false :
						elem === part;
					}
				}

				if (isPartStrNotTag) {
					Sizzle.filter(part, checkSet, true);
				}
			},
			">": function (checkSet, part, isXML) {
				var isPartStr = typeof part === "string";

				if (isPartStr && !/\W/.test(part)) {
					part = isXML ? part : part.toUpperCase();

					for (var i = 0, l = checkSet.length; i < l; i++) {
						var elem = checkSet[i];
						if (elem) {
							var parent = elem.parentNode;
							checkSet[i] = parent.nodeName === part ? parent : false;
						}
					}
				} else {
					for (var i = 0, l = checkSet.length; i < l; i++) {
						var elem = checkSet[i];
						if (elem) {
							checkSet[i] = isPartStr ?
							elem.parentNode :
							elem.parentNode === part;
						}
					}

					if (isPartStr) {
						Sizzle.filter(part, checkSet, true);
					}
				}
			},
			"": function (checkSet, part, isXML) {
				var doneName = done++, checkFn = dirCheck;

				if (!/\W/.test(part)) {
					var nodeCheck = part = isXML ? part : part.toUpperCase();
					checkFn = dirNodeCheck;
				}

				checkFn("parentNode", part, doneName, checkSet, nodeCheck, isXML);
			},
			"~": function (checkSet, part, isXML) {
				var doneName = done++, checkFn = dirCheck;

				if (typeof part === "string" && !/\W/.test(part)) {
					var nodeCheck = part = isXML ? part : part.toUpperCase();
					checkFn = dirNodeCheck;
				}

				checkFn("previousSibling", part, doneName, checkSet, nodeCheck, isXML);
			}
		},
		find: {
			ID: function (match, context, isXML) {
				if (typeof context.getElementById !== "undefined" && !isXML) {
					var m = context.getElementById(match[1]);
					return m ? [m] : [];
				}
			},
			NAME: function (match, context, isXML) {
				if (typeof context.getElementsByName !== "undefined") {
					var ret = [], results = context.getElementsByName(match[1]);

					for (var i = 0, l = results.length; i < l; i++) {
						if (results[i].getAttribute("name") === match[1]) {
							ret.push(results[i]);
						}
					}

					return ret.length === 0 ? null : ret;
				}
			},
			TAG: function (match, context) {
				return context.getElementsByTagName(match[1]);
			}
		},
		preFilter: {
			CLASS: function (match, curLoop, inplace, result, not, isXML) {
				match = " " + match[1].replace(/\\/g, "") + " ";

				if (isXML) {
					return match;
				}

				for (var i = 0, elem; (elem = curLoop[i]) != null; i++) {
					if (elem) {
						if (not ^ (elem.className && (" " + elem.className + " ").indexOf(match) >= 0)) {
							if (!inplace)
								result.push(elem);
						} else if (inplace) {
							curLoop[i] = false;
						}
					}
				}

				return false;
			},
			ID: function (match) {
				return match[1].replace(/\\/g, "");
			},
			TAG: function (match, curLoop) {
				for (var i = 0; curLoop[i] === false; i++) { }
				return curLoop[i] && isXML(curLoop[i]) ? match[1] : match[1].toUpperCase();
			},
			CHILD: function (match) {
				if (match[1] == "nth") {
					var test = /(-?)(\d*)n((?:\+|-)?\d*)/.exec(
					match[2] == "even" && "2n" || match[2] == "odd" && "2n+1" ||
					!/\D/.test(match[2]) && "0n+" + match[2] || match[2]);

					match[2] = (test[1] + (test[2] || 1)) - 0;
					match[3] = test[3] - 0;
				}

				match[0] = done++;

				return match;
			},
			ATTR: function (match, curLoop, inplace, result, not, isXML) {
				var name = match[1].replace(/\\/g, "");

				if (!isXML && Expr.attrMap[name]) {
					match[1] = Expr.attrMap[name];
				}

				if (match[2] === "~=") {
					match[4] = " " + match[4] + " ";
				}

				return match;
			},
			PSEUDO: function (match, curLoop, inplace, result, not) {
				if (match[1] === "not") {
					if ((chunker.exec(match[3]) || "").length > 1 || /^\w/.test(match[3])) {
						match[3] = Sizzle(match[3], null, null, curLoop);
					} else {
						var ret = Sizzle.filter(match[3], curLoop, inplace, true ^ not);
						if (!inplace) {
							result.push.apply(result, ret);
						}
						return false;
					}
				} else if (Expr.match.POS.test(match[0]) || Expr.match.CHILD.test(match[0])) {
					return true;
				}

				return match;
			},
			POS: function (match) {
				match.unshift(true);
				return match;
			}
		},
		filters: {
			enabled: function (elem) {
				return elem.disabled === false && elem.type !== "hidden";
			},
			disabled: function (elem) {
				return elem.disabled === true;
			},
			checked: function (elem) {
				return elem.checked === true;
			},
			selected: function (elem) {
				elem.parentNode.selectedIndex;
				return elem.selected === true;
			},
			parent: function (elem) {
				return !!elem.firstChild;
			},
			empty: function (elem) {
				return !elem.firstChild;
			},
			has: function (elem, i, match) {
				return !!Sizzle(match[3], elem).length;
			},
			header: function (elem) {
				return /h\d/i.test(elem.nodeName);
			},
			text: function (elem) {
				return "text" === elem.type;
			},
			radio: function (elem) {
				return "radio" === elem.type;
			},
			checkbox: function (elem) {
				return "checkbox" === elem.type;
			},
			file: function (elem) {
				return "file" === elem.type;
			},
			password: function (elem) {
				return "password" === elem.type;
			},
			submit: function (elem) {
				return "submit" === elem.type;
			},
			image: function (elem) {
				return "image" === elem.type;
			},
			reset: function (elem) {
				return "reset" === elem.type;
			},
			button: function (elem) {
				return "button" === elem.type || elem.nodeName.toUpperCase() === "BUTTON";
			},
			input: function (elem) {
				return /input|select|textarea|button/i.test(elem.nodeName);
			}
		},
		setFilters: {
			first: function (elem, i) {
				return i === 0;
			},
			last: function (elem, i, match, array) {
				return i === array.length - 1;
			},
			even: function (elem, i) {
				return i % 2 === 0;
			},
			odd: function (elem, i) {
				return i % 2 === 1;
			},
			lt: function (elem, i, match) {
				return i < match[3] - 0;
			},
			gt: function (elem, i, match) {
				return i > match[3] - 0;
			},
			nth: function (elem, i, match) {
				return match[3] - 0 == i;
			},
			eq: function (elem, i, match) {
				return match[3] - 0 == i;
			}
		},
		filter: {
			PSEUDO: function (elem, match, i, array) {
				var name = match[1], filter = Expr.filters[name];

				if (filter) {
					return filter(elem, i, match, array);
				} else if (name === "contains") {
					return (elem.textContent || elem.innerText || "").indexOf(match[3]) >= 0;
				} else if (name === "not") {
					var not = match[3];

					for (var i = 0, l = not.length; i < l; i++) {
						if (not[i] === elem) {
							return false;
						}
					}

					return true;
				}
			},
			CHILD: function (elem, match) {
				var type = match[1], node = elem;
				switch (type) {
					case 'only':
					case 'first':
						while ((node = node.previousSibling)) {
							if (node.nodeType === 1) return false;
						}
						if (type == 'first') return true;
						node = elem;
					case 'last':
						while ((node = node.nextSibling)) {
							if (node.nodeType === 1) return false;
						}
						return true;
					case 'nth':
						var first = match[2], last = match[3];

						if (first == 1 && last == 0) {
							return true;
						}

						var doneName = match[0],
						parent = elem.parentNode;

						if (parent && (parent.sizcache !== doneName || !elem.nodeIndex)) {
							var count = 0;
							for (node = parent.firstChild; node; node = node.nextSibling) {
								if (node.nodeType === 1) {
									node.nodeIndex = ++count;
								}
							}
							parent.sizcache = doneName;
						}

						var diff = elem.nodeIndex - last;
						if (first == 0) {
							return diff == 0;
						} else {
							return (diff % first == 0 && diff / first >= 0);
						}
				}
			},
			ID: function (elem, match) {
				return elem.nodeType === 1 && elem.getAttribute("id") === match;
			},
			TAG: function (elem, match) {
				return (match === "*" && elem.nodeType === 1) || elem.nodeName === match;
			},
			CLASS: function (elem, match) {
				return (" " + (elem.className || elem.getAttribute("class")) + " ")
				.indexOf(match) > -1;
			},
			ATTR: function (elem, match) {
				var name = match[1],
				result = Expr.attrHandle[name] ?
					Expr.attrHandle[name](elem) :
					elem[name] != null ?
						elem[name] :
						elem.getAttribute(name),
				value = result + "",
				type = match[2],
				check = match[4];

				return result == null ?
				type === "!=" :
				type === "=" ?
				value === check :
				type === "*=" ?
				value.indexOf(check) >= 0 :
				type === "~=" ?
				(" " + value + " ").indexOf(check) >= 0 :
				!check ?
				value && result !== false :
				type === "!=" ?
				value != check :
				type === "^=" ?
				value.indexOf(check) === 0 :
				type === "$=" ?
				value.substr(value.length - check.length) === check :
				type === "|=" ?
				value === check || value.substr(0, check.length + 1) === check + "-" :
				false;
			},
			POS: function (elem, match, i, array) {
				var name = match[2], filter = Expr.setFilters[name];

				if (filter) {
					return filter(elem, i, match, array);
				}
			}
		}
	};

	var origPOS = Expr.match.POS;

	for (var type in Expr.match) {
		Expr.match[type] = new RegExp(Expr.match[type].source + /(?![^\[]*\])(?![^\(]*\))/.source);
		Expr.leftMatch[type] = new RegExp(/(^(?:.|\r|\n)*?)/.source + Expr.match[type].source);
	}

	var makeArray = function (array, results) {
		array = Array.prototype.slice.call(array, 0);

		if (results) {
			results.push.apply(results, array);
			return results;
		}

		return array;
	};

	try {
		Array.prototype.slice.call(document.documentElement.childNodes, 0);

	} catch (e) {
		makeArray = function (array, results) {
			var ret = results || [];

			if (toString.call(array) === "[object Array]") {
				Array.prototype.push.apply(ret, array);
			} else {
				if (typeof array.length === "number") {
					for (var i = 0, l = array.length; i < l; i++) {
						ret.push(array[i]);
					}
				} else {
					for (var i = 0; array[i]; i++) {
						ret.push(array[i]);
					}
				}
			}

			return ret;
		};
	}

	var sortOrder;

	if (document.documentElement.compareDocumentPosition) {
		sortOrder = function (a, b) {
			if (!a.compareDocumentPosition || !b.compareDocumentPosition) {
				if (a == b) {
					hasDuplicate = true;
				}
				return 0;
			}

			var ret = a.compareDocumentPosition(b) & 4 ? -1 : a === b ? 0 : 1;
			if (ret === 0) {
				hasDuplicate = true;
			}
			return ret;
		};
	} else if ("sourceIndex" in document.documentElement) {
		sortOrder = function (a, b) {
			if (!a.sourceIndex || !b.sourceIndex) {
				if (a == b) {
					hasDuplicate = true;
				}
				return 0;
			}

			var ret = a.sourceIndex - b.sourceIndex;
			if (ret === 0) {
				hasDuplicate = true;
			}
			return ret;
		};
	} else if (document.createRange) {
		sortOrder = function (a, b) {
			if (!a.ownerDocument || !b.ownerDocument) {
				if (a == b) {
					hasDuplicate = true;
				}
				return 0;
			}

			var aRange = a.ownerDocument.createRange(), bRange = b.ownerDocument.createRange();
			aRange.setStart(a, 0);
			aRange.setEnd(a, 0);
			bRange.setStart(b, 0);
			bRange.setEnd(b, 0);
			var ret = aRange.compareBoundaryPoints(Range.START_TO_END, bRange);
			if (ret === 0) {
				hasDuplicate = true;
			}
			return ret;
		};
	}

	(function () {
		var form = document.createElement("div"),
		id = "script" + (new Date).getTime();
		form.innerHTML = "<a name='" + id + "'/>";

		var root = document.documentElement;
		root.insertBefore(form, root.firstChild);

		if (!!document.getElementById(id)) {
			Expr.find.ID = function (match, context, isXML) {
				if (typeof context.getElementById !== "undefined" && !isXML) {
					var m = context.getElementById(match[1]);
					return m ? m.id === match[1] || typeof m.getAttributeNode !== "undefined" && m.getAttributeNode("id").nodeValue === match[1] ? [m] : undefined : [];
				}
			};

			Expr.filter.ID = function (elem, match) {
				var node = typeof elem.getAttributeNode !== "undefined" && elem.getAttributeNode("id");
				return elem.nodeType === 1 && node && node.nodeValue === match;
			};
		}

		root.removeChild(form);
		root = form = null; // release memory in IE
	})();

	(function () {

		var div = document.createElement("div");
		div.appendChild(document.createComment(""));

		if (div.getElementsByTagName("*").length > 0) {
			Expr.find.TAG = function (match, context) {
				var results = context.getElementsByTagName(match[1]);

				if (match[1] === "*") {
					var tmp = [];

					for (var i = 0; results[i]; i++) {
						if (results[i].nodeType === 1) {
							tmp.push(results[i]);
						}
					}

					results = tmp;
				}

				return results;
			};
		}

		div.innerHTML = "<a href='#'></a>";
		if (div.firstChild && typeof div.firstChild.getAttribute !== "undefined" &&
			div.firstChild.getAttribute("href") !== "#") {
			Expr.attrHandle.href = function (elem) {
				return elem.getAttribute("href", 2);
			};
		}

		div = null; // release memory in IE
	})();

	if (document.querySelectorAll) (function () {
		var oldSizzle = Sizzle, div = document.createElement("div");
		div.innerHTML = "<p class='TEST'></p>";

		if (div.querySelectorAll && div.querySelectorAll(".TEST").length === 0) {
			return;
		}

		Sizzle = function (query, context, extra, seed) {
			context = context || document;

			if (!seed && context.nodeType === 9 && !isXML(context)) {
				try {
					return makeArray(context.querySelectorAll(query), extra);
				} catch (e) { }
			}

			return oldSizzle(query, context, extra, seed);
		};

		for (var prop in oldSizzle) {
			Sizzle[prop] = oldSizzle[prop];
		}

		div = null; // release memory in IE
	})();

	if (document.getElementsByClassName && document.documentElement.getElementsByClassName) (function () {
		var div = document.createElement("div");
		div.innerHTML = "<div class='test e'></div><div class='test'></div>";

		if (div.getElementsByClassName("e").length === 0)
			return;

		div.lastChild.className = "e";

		if (div.getElementsByClassName("e").length === 1)
			return;

		Expr.order.splice(1, 0, "CLASS");
		Expr.find.CLASS = function (match, context, isXML) {
			if (typeof context.getElementsByClassName !== "undefined" && !isXML) {
				return context.getElementsByClassName(match[1]);
			}
		};

		div = null; // release memory in IE
	})();

	function dirNodeCheck(dir, cur, doneName, checkSet, nodeCheck, isXML) {
		var sibDir = dir == "previousSibling" && !isXML;
		for (var i = 0, l = checkSet.length; i < l; i++) {
			var elem = checkSet[i];
			if (elem) {
				if (sibDir && elem.nodeType === 1) {
					elem.sizcache = doneName;
					elem.sizset = i;
				}
				elem = elem[dir];
				var match = false;

				while (elem) {
					if (elem.sizcache === doneName) {
						match = checkSet[elem.sizset];
						break;
					}

					if (elem.nodeType === 1 && !isXML) {
						elem.sizcache = doneName;
						elem.sizset = i;
					}

					if (elem.nodeName === cur) {
						match = elem;
						break;
					}

					elem = elem[dir];
				}

				checkSet[i] = match;
			}
		}
	}

	function dirCheck(dir, cur, doneName, checkSet, nodeCheck, isXML) {
		var sibDir = dir == "previousSibling" && !isXML;
		for (var i = 0, l = checkSet.length; i < l; i++) {
			var elem = checkSet[i];
			if (elem) {
				if (sibDir && elem.nodeType === 1) {
					elem.sizcache = doneName;
					elem.sizset = i;
				}
				elem = elem[dir];
				var match = false;

				while (elem) {
					if (elem.sizcache === doneName) {
						match = checkSet[elem.sizset];
						break;
					}

					if (elem.nodeType === 1) {
						if (!isXML) {
							elem.sizcache = doneName;
							elem.sizset = i;
						}
						if (typeof cur !== "string") {
							if (elem === cur) {
								match = true;
								break;
							}

						} else if (Sizzle.filter(cur, [elem]).length > 0) {
							match = elem;
							break;
						}
					}

					elem = elem[dir];
				}

				checkSet[i] = match;
			}
		}
	}

	var contains = document.compareDocumentPosition ? function (a, b) {
		return a.compareDocumentPosition(b) & 16;
	} : function (a, b) {
		return a !== b && (a.contains ? a.contains(b) : true);
	};

	var isXML = function (elem) {
		return elem.nodeType === 9 && elem.documentElement.nodeName !== "HTML" ||
		!!elem.ownerDocument && elem.ownerDocument.documentElement.nodeName !== "HTML";
	};

	var posProcess = function (selector, context) {
		var tmpSet = [], later = "", match,
		root = context.nodeType ? [context] : context;

		while ((match = Expr.match.PSEUDO.exec(selector))) {
			later += match[0];
			selector = selector.replace(Expr.match.PSEUDO, "");
		}

		selector = Expr.relative[selector] ? selector + "*" : selector;

		for (var i = 0, l = root.length; i < l; i++) {
			Sizzle(selector, root[i], tmpSet);
		}

		return Sizzle.filter(later, tmpSet);
	};


	window.Sizzle = Sizzle;

})();

; (function (engine) {
	var extendElements = Prototype.Selector.extendElements;

	function select(selector, scope) {
		return extendElements(engine(selector, scope || document));
	}

	function match(element, selector) {
		return engine.matches(selector, [element]).length == 1;
	}

	Prototype.Selector.engine = engine;
	Prototype.Selector.select = select;
	Prototype.Selector.match = match;
})(Sizzle);

window.Sizzle = Prototype._original_property;
delete Prototype._original_property;

var Form = {
	reset: function (form) {
		form = $(form);
		form.reset();
		return form;
	},

	serializeElements: function (elements, options) {
		if (typeof options != 'object') options = { hash: !!options };
		else if (Object.isUndefined(options.hash)) options.hash = true;
		var key, value, submitted = false, submit = options.submit, accumulator, initial;

		if (options.hash) {
			initial = {};
			accumulator = function (result, key, value) {
				if (key in result) {
					if (!Object.isArray(result[key])) result[key] = [result[key]];
					result[key].push(value);
				} else result[key] = value;
				return result;
			};
		} else {
			initial = '';
			accumulator = function (result, key, value) {
				return result + (result ? '&' : '') + encodeURIComponent(key) + '=' + encodeURIComponent(value);
			}
		}

		return elements.inject(initial, function (result, element) {
			if (!element.disabled && element.name) {
				key = element.name; value = $(element).getValue();
				if (value != null && element.type != 'file' && (element.type != 'submit' || (!submitted &&
            submit !== false && (!submit || key == submit) && (submitted = true)))) {
					result = accumulator(result, key, value);
				}
			}
			return result;
		});
	}
};

Form.Methods = {
	serialize: function (form, options) {
		return Form.serializeElements(Form.getElements(form), options);
	},

	getElements: function (form) {
		var elements = $(form).getElementsByTagName('*'),
        element,
        arr = [],
        serializers = Form.Element.Serializers;
		for (var i = 0; element = elements[i]; i++) {
			arr.push(element);
		}
		return arr.inject([], function (elements, child) {
			if (serializers[child.tagName.toLowerCase()])
				elements.push(Element.extend(child));
			return elements;
		})
	},

	getInputs: function (form, typeName, name) {
		form = $(form);
		var inputs = form.getElementsByTagName('input');

		if (!typeName && !name) return $A(inputs).map(Element.extend);

		for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {
			var input = inputs[i];
			if ((typeName && input.type != typeName) || (name && input.name != name))
				continue;
			matchingInputs.push(Element.extend(input));
		}

		return matchingInputs;
	},

	disable: function (form) {
		form = $(form);
		Form.getElements(form).invoke('disable');
		return form;
	},

	enable: function (form) {
		form = $(form);
		Form.getElements(form).invoke('enable');
		return form;
	},

	findFirstElement: function (form) {
		var elements = $(form).getElements().findAll(function (element) {
			return 'hidden' != element.type && !element.disabled;
		});
		var firstByIndex = elements.findAll(function (element) {
			return element.hasAttribute('tabIndex') && element.tabIndex >= 0;
		}).sortBy(function (element) { return element.tabIndex }).first();

		return firstByIndex ? firstByIndex : elements.find(function (element) {
			return /^(?:input|select|textarea)$/i.test(element.tagName);
		});
	},

	focusFirstElement: function (form) {
		form = $(form);
		var element = form.findFirstElement();
		if (element) element.activate();
		return form;
	},

	request: function (form, options) {
		form = $(form), options = Object.clone(options || {});

		var params = options.parameters, action = form.readAttribute('action') || '';
		if (action.blank()) action = window.location.href;
		options.parameters = form.serialize(true);

		if (params) {
			if (Object.isString(params)) params = params.toQueryParams();
			Object.extend(options.parameters, params);
		}

		if (form.hasAttribute('method') && !options.method)
			options.method = form.method;

		return new Ajax.Request(action, options);
	}
};

/*--------------------------------------------------------------------------*/


Form.Element = {
	focus: function (element) {
		$(element).focus();
		return element;
	},

	select: function (element) {
		$(element).select();
		return element;
	}
};

Form.Element.Methods = {

	serialize: function (element) {
		element = $(element);
		if (!element.disabled && element.name) {
			var value = element.getValue();
			if (value != undefined) {
				var pair = {};
				pair[element.name] = value;
				return Object.toQueryString(pair);
			}
		}
		return '';
	},

	getValue: function (element) {
		element = $(element);
		var method = element.tagName.toLowerCase();
		return Form.Element.Serializers[method](element);
	},

	setValue: function (element, value) {
		element = $(element);
		var method = element.tagName.toLowerCase();
		Form.Element.Serializers[method](element, value);
		return element;
	},

	clear: function (element) {
		$(element).value = '';
		return element;
	},

	present: function (element) {
		return $(element).value != '';
	},

	activate: function (element) {
		element = $(element);
		try {
			element.focus();
			if (element.select && (element.tagName.toLowerCase() != 'input' ||
          !(/^(?:button|reset|submit)$/i.test(element.type))))
				element.select();
		} catch (e) { }
		return element;
	},

	disable: function (element) {
		element = $(element);
		element.disabled = true;
		return element;
	},

	enable: function (element) {
		element = $(element);
		element.disabled = false;
		return element;
	}
};

/*--------------------------------------------------------------------------*/

var Field = Form.Element;

var $F = Form.Element.Methods.getValue;

/*--------------------------------------------------------------------------*/

Form.Element.Serializers = (function () {
	function input(element, value) {
		switch (element.type.toLowerCase()) {
			case 'checkbox':
			case 'radio':
				return inputSelector(element, value);
			default:
				return valueSelector(element, value);
		}
	}

	function inputSelector(element, value) {
		if (Object.isUndefined(value))
			return element.checked ? element.value : null;
		else element.checked = !!value;
	}

	function valueSelector(element, value) {
		if (Object.isUndefined(value)) return element.value;
		else element.value = value;
	}

	function select(element, value) {
		if (Object.isUndefined(value))
			return (element.type === 'select-one' ? selectOne : selectMany)(element);

		var opt, currentValue, single = !Object.isArray(value);
		for (var i = 0, length = element.length; i < length; i++) {
			opt = element.options[i];
			currentValue = this.optionValue(opt);
			if (single) {
				if (currentValue == value) {
					opt.selected = true;
					return;
				}
			}
			else opt.selected = value.include(currentValue);
		}
	}

	function selectOne(element) {
		var index = element.selectedIndex;
		return index >= 0 ? optionValue(element.options[index]) : null;
	}

	function selectMany(element) {
		var values, length = element.length;
		if (!length) return null;

		for (var i = 0, values = []; i < length; i++) {
			var opt = element.options[i];
			if (opt.selected) values.push(optionValue(opt));
		}
		return values;
	}

	function optionValue(opt) {
		return Element.hasAttribute(opt, 'value') ? opt.value : opt.text;
	}

	return {
		input: input,
		inputSelector: inputSelector,
		textarea: valueSelector,
		select: select,
		selectOne: selectOne,
		selectMany: selectMany,
		optionValue: optionValue,
		button: valueSelector
	};
})();

/*--------------------------------------------------------------------------*/


Abstract.TimedObserver = Class.create(PeriodicalExecuter, {
	initialize: function ($super, element, frequency, callback) {
		$super(callback, frequency);
		this.element = $(element);
		this.lastValue = this.getValue();
	},

	execute: function () {
		var value = this.getValue();
		if (Object.isString(this.lastValue) && Object.isString(value) ?
        this.lastValue != value : String(this.lastValue) != String(value)) {
			this.callback(this.element, value);
			this.lastValue = value;
		}
	}
});

Form.Element.Observer = Class.create(Abstract.TimedObserver, {
	getValue: function () {
		return Form.Element.getValue(this.element);
	}
});

Form.Observer = Class.create(Abstract.TimedObserver, {
	getValue: function () {
		return Form.serialize(this.element);
	}
});

/*--------------------------------------------------------------------------*/

Abstract.EventObserver = Class.create({
	initialize: function (element, callback) {
		this.element = $(element);
		this.callback = callback;

		this.lastValue = this.getValue();
		if (this.element.tagName.toLowerCase() == 'form')
			this.registerFormCallbacks();
		else
			this.registerCallback(this.element);
	},

	onElementEvent: function () {
		var value = this.getValue();
		if (this.lastValue != value) {
			this.callback(this.element, value);
			this.lastValue = value;
		}
	},

	registerFormCallbacks: function () {
		Form.getElements(this.element).each(this.registerCallback, this);
	},

	registerCallback: function (element) {
		if (element.type) {
			switch (element.type.toLowerCase()) {
				case 'checkbox':
				case 'radio':
					Event.observe(element, 'click', this.onElementEvent.bind(this));
					break;
				default:
					Event.observe(element, 'change', this.onElementEvent.bind(this));
					break;
			}
		}
	}
});

Form.Element.EventObserver = Class.create(Abstract.EventObserver, {
	getValue: function () {
		return Form.Element.getValue(this.element);
	}
});

Form.EventObserver = Class.create(Abstract.EventObserver, {
	getValue: function () {
		return Form.serialize(this.element);
	}
});
(function () {

	var Event = {
		KEY_BACKSPACE: 8,
		KEY_TAB: 9,
		KEY_RETURN: 13,
		KEY_ESC: 27,
		KEY_LEFT: 37,
		KEY_UP: 38,
		KEY_RIGHT: 39,
		KEY_DOWN: 40,
		KEY_DELETE: 46,
		KEY_HOME: 36,
		KEY_END: 35,
		KEY_PAGEUP: 33,
		KEY_PAGEDOWN: 34,
		KEY_INSERT: 45,

		cache: {}
	};

	var docEl = document.documentElement;
	var MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED = 'onmouseenter' in docEl
    && 'onmouseleave' in docEl;



	var isIELegacyEvent = function (event) { return false; };

	if (window.attachEvent) {
		if (window.addEventListener) {
			isIELegacyEvent = function (event) {
				return !(event instanceof window.Event);
			};
		} else {
			isIELegacyEvent = function (event) { return true; };
		}
	}

	var _isButton;

	function _isButtonForDOMEvents(event, code) {
		return event.which ? (event.which === code + 1) : (event.button === code);
	}

	var legacyButtonMap = { 0: 1, 1: 4, 2: 2 };
	function _isButtonForLegacyEvents(event, code) {
		return event.button === legacyButtonMap[code];
	}

	function _isButtonForWebKit(event, code) {
		switch (code) {
			case 0: return event.which == 1 && !event.metaKey;
			case 1: return event.which == 2 || (event.which == 1 && event.metaKey);
			case 2: return event.which == 3;
			default: return false;
		}
	}

	if (window.attachEvent) {
		if (!window.addEventListener) {
			_isButton = _isButtonForLegacyEvents;
		} else {
			_isButton = function (event, code) {
				return isIELegacyEvent(event) ? _isButtonForLegacyEvents(event, code) :
         _isButtonForDOMEvents(event, code);
			}
		}
	} else if (Prototype.Browser.WebKit) {
		_isButton = _isButtonForWebKit;
	} else {
		_isButton = _isButtonForDOMEvents;
	}

	function isLeftClick(event) { return _isButton(event, 0) }

	function isMiddleClick(event) { return _isButton(event, 1) }

	function isRightClick(event) { return _isButton(event, 2) }

	function element(event) {
		event = Event.extend(event);

		var node = event.target, type = event.type,
     currentTarget = event.currentTarget;

		if (currentTarget && currentTarget.tagName) {
			if (type === 'load' || type === 'error' ||
        (type === 'click' && currentTarget.tagName.toLowerCase() === 'input'
          && currentTarget.type === 'radio'))
				node = currentTarget;
		}

		if (node.nodeType == Node.TEXT_NODE)
			node = node.parentNode;

		return Element.extend(node);
	}

	function findElement(event, expression) {
		var element = Event.element(event);

		if (!expression) return element;
		while (element) {
			if (Object.isElement(element) && Prototype.Selector.match(element, expression)) {
				return Element.extend(element);
			}
			element = element.parentNode;
		}
	}

	function pointer(event) {
		return { x: pointerX(event), y: pointerY(event) };
	}

	function pointerX(event) {
		var docElement = document.documentElement,
     body = document.body || { scrollLeft: 0 };

		return event.pageX || (event.clientX +
      (docElement.scrollLeft || body.scrollLeft) -
      (docElement.clientLeft || 0));
	}

	function pointerY(event) {
		var docElement = document.documentElement,
     body = document.body || { scrollTop: 0 };

		return event.pageY || (event.clientY +
       (docElement.scrollTop || body.scrollTop) -
       (docElement.clientTop || 0));
	}


	function stop(event) {
		Event.extend(event);
		event.preventDefault();
		event.stopPropagation();

		event.stopped = true;
	}


	Event.Methods = {
		isLeftClick: isLeftClick,
		isMiddleClick: isMiddleClick,
		isRightClick: isRightClick,

		element: element,
		findElement: findElement,

		pointer: pointer,
		pointerX: pointerX,
		pointerY: pointerY,

		stop: stop
	};

	var methods = Object.keys(Event.Methods).inject({}, function (m, name) {
		m[name] = Event.Methods[name].methodize();
		return m;
	});

	if (window.attachEvent) {
		function _relatedTarget(event) {
			var element;
			switch (event.type) {
				case 'mouseover':
				case 'mouseenter':
					element = event.fromElement;
					break;
				case 'mouseout':
				case 'mouseleave':
					element = event.toElement;
					break;
				default:
					return null;
			}
			return Element.extend(element);
		}

		var additionalMethods = {
			stopPropagation: function () { this.cancelBubble = true },
			preventDefault: function () { this.returnValue = false },
			inspect: function () { return '[object Event]' }
		};

		Event.extend = function (event, element) {
			if (!event) return false;

			if (!isIELegacyEvent(event)) return event;

			if (event._extendedByPrototype) return event;
			event._extendedByPrototype = Prototype.emptyFunction;

			var pointer = Event.pointer(event);

			Object.extend(event, {
				target: event.srcElement || element,
				relatedTarget: _relatedTarget(event),
				pageX: pointer.x,
				pageY: pointer.y
			});

			Object.extend(event, methods);
			Object.extend(event, additionalMethods);

			return event;
		};
	} else {
		Event.extend = Prototype.K;
	}

	if (window.addEventListener) {
		Event.prototype = window.Event.prototype || document.createEvent('HTMLEvents').__proto__;
		Object.extend(Event.prototype, methods);
	}

	function _createResponder(element, eventName, handler) {
		var registry = Element.retrieve(element, 'prototype_event_registry');

		if (Object.isUndefined(registry)) {
			CACHE.push(element);
			registry = Element.retrieve(element, 'prototype_event_registry', $H());
		}

		var respondersForEvent = registry.get(eventName);
		if (Object.isUndefined(respondersForEvent)) {
			respondersForEvent = [];
			registry.set(eventName, respondersForEvent);
		}

		if (respondersForEvent.pluck('handler').include(handler)) return false;

		var responder;
		if (eventName.include(":")) {
			responder = function (event) {
				if (Object.isUndefined(event.eventName))
					return false;

				if (event.eventName !== eventName)
					return false;

				Event.extend(event, element);
				handler.call(element, event);
			};
		} else {
			if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED &&
       (eventName === "mouseenter" || eventName === "mouseleave")) {
				if (eventName === "mouseenter" || eventName === "mouseleave") {
					responder = function (event) {
						Event.extend(event, element);

						var parent = event.relatedTarget;
						while (parent && parent !== element) {
							try { parent = parent.parentNode; }
							catch (e) { parent = element; }
						}

						if (parent === element) return;

						handler.call(element, event);
					};
				}
			} else {
				responder = function (event) {
					Event.extend(event, element);
					handler.call(element, event);
				};
			}
		}

		responder.handler = handler;
		respondersForEvent.push(responder);
		return responder;
	}

	function _destroyCache() {
		for (var i = 0, length = CACHE.length; i < length; i++) {
			Event.stopObserving(CACHE[i]);
			CACHE[i] = null;
		}
	}

	var CACHE = [];

	if (Prototype.Browser.IE)
		window.attachEvent('onunload', _destroyCache);

	if (Prototype.Browser.WebKit)
		window.addEventListener('unload', Prototype.emptyFunction, false);


	var _getDOMEventName = Prototype.K,
      translations = { mouseenter: "mouseover", mouseleave: "mouseout" };

	if (!MOUSEENTER_MOUSELEAVE_EVENTS_SUPPORTED) {
		_getDOMEventName = function (eventName) {
			return (translations[eventName] || eventName);
		};
	}

	function observe(element, eventName, handler) {
		element = $(element);

		var responder = _createResponder(element, eventName, handler);

		if (!responder) return element;

		if (eventName.include(':')) {
			if (element.addEventListener)
				element.addEventListener("dataavailable", responder, false);
			else {
				element.attachEvent("ondataavailable", responder);
				element.attachEvent("onlosecapture", responder);
			}
		} else {
			var actualEventName = _getDOMEventName(eventName);

			if (element.addEventListener)
				element.addEventListener(actualEventName, responder, false);
			else
				element.attachEvent("on" + actualEventName, responder);
		}

		return element;
	}

	function stopObserving(element, eventName, handler) {
		element = $(element);

		var registry = Element.retrieve(element, 'prototype_event_registry');
		if (!registry) return element;

		if (!eventName) {
			registry.each(function (pair) {
				var eventName = pair.key;
				stopObserving(element, eventName);
			});
			return element;
		}

		var responders = registry.get(eventName);
		if (!responders) return element;

		if (!handler) {
			responders.each(function (r) {
				stopObserving(element, eventName, r.handler);
			});
			return element;
		}

		var i = responders.length, responder;
		while (i--) {
			if (responders[i].handler === handler) {
				responder = responders[i];
				break;
			}
		}
		if (!responder) return element;

		if (eventName.include(':')) {
			if (element.removeEventListener)
				element.removeEventListener("dataavailable", responder, false);
			else {
				element.detachEvent("ondataavailable", responder);
				element.detachEvent("onlosecapture", responder);
			}
		} else {
			var actualEventName = _getDOMEventName(eventName);
			if (element.removeEventListener)
				element.removeEventListener(actualEventName, responder, false);
			else
				element.detachEvent('on' + actualEventName, responder);
		}

		registry.set(eventName, responders.without(responder));

		return element;
	}

	function fire(element, eventName, memo, bubble) {
		element = $(element);

		if (Object.isUndefined(bubble))
			bubble = true;

		if (element == document && document.createEvent && !element.dispatchEvent)
			element = document.documentElement;

		var event;
		if (document.createEvent) {
			event = document.createEvent('HTMLEvents');
			event.initEvent('dataavailable', bubble, true);
		} else {
			event = document.createEventObject();
			event.eventType = bubble ? 'ondataavailable' : 'onlosecapture';
		}

		event.eventName = eventName;
		event.memo = memo || {};

		if (document.createEvent)
			element.dispatchEvent(event);
		else
			element.fireEvent(event.eventType, event);

		return Event.extend(event);
	}

	Event.Handler = Class.create({
		initialize: function (element, eventName, selector, callback) {
			this.element = $(element);
			this.eventName = eventName;
			this.selector = selector;
			this.callback = callback;
			this.handler = this.handleEvent.bind(this);
		},

		start: function () {
			Event.observe(this.element, this.eventName, this.handler);
			return this;
		},

		stop: function () {
			Event.stopObserving(this.element, this.eventName, this.handler);
			return this;
		},

		handleEvent: function (event) {
			var element = Event.findElement(event, this.selector);
			if (element) this.callback.call(this.element, event, element);
		}
	});

	function on(element, eventName, selector, callback) {
		element = $(element);
		if (Object.isFunction(selector) && Object.isUndefined(callback)) {
			callback = selector, selector = null;
		}

		return new Event.Handler(element, eventName, selector, callback).start();
	}

	Object.extend(Event, Event.Methods);

	Object.extend(Event, {
		fire: fire,
		observe: observe,
		stopObserving: stopObserving,
		on: on
	});

	Element.addMethods({
		fire: fire,

		observe: observe,

		stopObserving: stopObserving,

		on: on
	});

	Object.extend(document, {
		fire: fire.methodize(),

		observe: observe.methodize(),

		stopObserving: stopObserving.methodize(),

		on: on.methodize(),

		loaded: false
	});

	if (window.Event) Object.extend(window.Event, Event);
	else window.Event = Event;
})();

(function () {
	/* Support for the DOMContentLoaded event is based on work by Dan Webb,
	Matthias Miller, Dean Edwards, John Resig, and Diego Perini. */

	var timer;

	function fireContentLoadedEvent() {
		if (document.loaded) return;
		if (timer) window.clearTimeout(timer);
		document.loaded = true;
		document.fire('dom:loaded');
	}

	function checkReadyState() {
		if (document.readyState === 'complete') {
			document.stopObserving('readystatechange', checkReadyState);
			fireContentLoadedEvent();
		}
	}

	function pollDoScroll() {
		try { document.documentElement.doScroll('left'); }
		catch (e) {
			timer = pollDoScroll.defer();
			return;
		}
		fireContentLoadedEvent();
	}

	if (document.addEventListener) {
		document.addEventListener('DOMContentLoaded', fireContentLoadedEvent, false);
	} else {
		document.observe('readystatechange', checkReadyState);
		if (window == top)
			timer = pollDoScroll.defer();
	}

	Event.observe(window, 'load', fireContentLoadedEvent);
})();

Element.addMethods();

/*------------------------------- DEPRECATED -------------------------------*/

Hash.toQueryString = Object.toQueryString;

var Toggle = { display: Element.toggle };

Element.Methods.childOf = Element.Methods.descendantOf;

var Insertion = {
	Before: function (element, content) {
		return Element.insert(element, { before: content });
	},

	Top: function (element, content) {
		return Element.insert(element, { top: content });
	},

	Bottom: function (element, content) {
		return Element.insert(element, { bottom: content });
	},

	After: function (element, content) {
		return Element.insert(element, { after: content });
	}
};

var $continue = new Error('"throw $continue" is deprecated, use "return" instead');

var Position = {
	includeScrollOffsets: false,

	prepare: function () {
		this.deltaX = window.pageXOffset
                || document.documentElement.scrollLeft
                || document.body.scrollLeft
                || 0;
		this.deltaY = window.pageYOffset
                || document.documentElement.scrollTop
                || document.body.scrollTop
                || 0;
	},

	within: function (element, x, y) {
		if (this.includeScrollOffsets)
			return this.withinIncludingScrolloffsets(element, x, y);
		this.xcomp = x;
		this.ycomp = y;
		this.offset = Element.cumulativeOffset(element);

		return (y >= this.offset[1] &&
            y < this.offset[1] + element.offsetHeight &&
            x >= this.offset[0] &&
            x < this.offset[0] + element.offsetWidth);
	},

	withinIncludingScrolloffsets: function (element, x, y) {
		var offsetcache = Element.cumulativeScrollOffset(element);

		this.xcomp = x + offsetcache[0] - this.deltaX;
		this.ycomp = y + offsetcache[1] - this.deltaY;
		this.offset = Element.cumulativeOffset(element);

		return (this.ycomp >= this.offset[1] &&
            this.ycomp < this.offset[1] + element.offsetHeight &&
            this.xcomp >= this.offset[0] &&
            this.xcomp < this.offset[0] + element.offsetWidth);
	},

	overlap: function (mode, element) {
		if (!mode) return 0;
		if (mode == 'vertical')
			return ((this.offset[1] + element.offsetHeight) - this.ycomp) /
        element.offsetHeight;
		if (mode == 'horizontal')
			return ((this.offset[0] + element.offsetWidth) - this.xcomp) /
        element.offsetWidth;
	},


	cumulativeOffset: Element.Methods.cumulativeOffset,

	positionedOffset: Element.Methods.positionedOffset,

	absolutize: function (element) {
		Position.prepare();
		return Element.absolutize(element);
	},

	relativize: function (element) {
		Position.prepare();
		return Element.relativize(element);
	},

	realOffset: Element.Methods.cumulativeScrollOffset,

	offsetParent: Element.Methods.getOffsetParent,

	page: Element.Methods.viewportOffset,

	clone: function (source, target, options) {
		options = options || {};
		return Element.clonePosition(target, source, options);
	}
};

/*--------------------------------------------------------------------------*/

if (!document.getElementsByClassName) document.getElementsByClassName = function (instanceMethods) {
	function iter(name) {
		return name.blank() ? null : "[contains(concat(' ', @class, ' '), ' " + name + " ')]";
	}

	instanceMethods.getElementsByClassName = Prototype.BrowserFeatures.XPath ?
  function (element, className) {
  	className = className.toString().strip();
  	var cond = /\s/.test(className) ? $w(className).map(iter).join('') : iter(className);
  	return cond ? document._getElementsByXPath('.//*' + cond, element) : [];
  } : function (element, className) {
  	className = className.toString().strip();
  	var elements = [], classNames = (/\s/.test(className) ? $w(className) : null);
  	if (!classNames && !className) return elements;

  	var nodes = $(element).getElementsByTagName('*');
  	className = ' ' + className + ' ';

  	for (var i = 0, child, cn; child = nodes[i]; i++) {
  		if (child.className && (cn = ' ' + child.className + ' ') && (cn.include(className) ||
          (classNames && classNames.all(function (name) {
          	return !name.toString().blank() && cn.include(' ' + name + ' ');
          }))))
  			elements.push(Element.extend(child));
  	}
  	return elements;
  };

	return function (className, parentElement) {
		return $(parentElement || document.body).getElementsByClassName(className);
	};
} (Element.Methods);

/*--------------------------------------------------------------------------*/

Element.ClassNames = Class.create();
Element.ClassNames.prototype = {
	initialize: function (element) {
		this.element = $(element);
	},

	_each: function (iterator) {
		this.element.className.split(/\s+/).select(function (name) {
			return name.length > 0;
		})._each(iterator);
	},

	set: function (className) {
		this.element.className = className;
	},

	add: function (classNameToAdd) {
		if (this.include(classNameToAdd)) return;
		this.set($A(this).concat(classNameToAdd).join(' '));
	},

	remove: function (classNameToRemove) {
		if (!this.include(classNameToRemove)) return;
		this.set($A(this).without(classNameToRemove).join(' '));
	},

	toString: function () {
		return $A(this).join(' ');
	}
};

Object.extend(Element.ClassNames.prototype, Enumerable);

/*--------------------------------------------------------------------------*/

(function () {
	window.Selector = Class.create({
		initialize: function (expression) {
			this.expression = expression.strip();
		},

		findElements: function (rootElement) {
			return Prototype.Selector.select(this.expression, rootElement);
		},

		match: function (element) {
			return Prototype.Selector.match(element, this.expression);
		},

		toString: function () {
			return this.expression;
		},

		inspect: function () {
			return "#<Selector: " + this.expression + ">";
		}
	});

	Object.extend(Selector, {
		matchElements: function (elements, expression) {
			var match = Prototype.Selector.match,
          results = [];

			for (var i = 0, length = elements.length; i < length; i++) {
				var element = elements[i];
				if (match(element, expression)) {
					results.push(Element.extend(element));
				}
			}
			return results;
		},

		findElement: function (elements, expression, index) {
			index = index || 0;
			var matchIndex = 0, element;
			for (var i = 0, length = elements.length; i < length; i++) {
				element = elements[i];
				if (Prototype.Selector.match(element, expression) && index === matchIndex++) {
					return Element.extend(element);
				}
			}
		},

		findChildElements: function (element, expressions) {
			var selector = expressions.toArray().join(', ');
			return Prototype.Selector.select(selector, element || document);
		}
	});
})();