//  Prototype JavaScript framework, version 1.6.0.2, (c) 2005-2008 Sam Stephenson

var Prototype =
{
	Version: '1.6.0.2',
	Browser:
	{
		IE: !!(window.attachEvent && !window.opera),
		Opera: !!window.opera,
		WebKit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
		Gecko: navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
		MobileSafari: !!navigator.userAgent.match(/Apple.*Mobile.*Safari/)
	},
	BrowserFeatures:
	{
		XPath: !!document.evaluate,
		ElementExtensions: !!window.HTMLElement,
		SpecificElementExtensions:
		document.createElement('div').__proto__ &&
		document.createElement('div').__proto__ !==
		document.createElement('form').__proto__
	},
	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 Class =
{
	create: function()
	{
		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)
		{
			var subclass = function() { };
			subclass.prototype = parent.prototype;
			klass.prototype = new subclass;
			parent.subclasses.push(klass);
		}
		for(var i = 0; i < properties.length; i++)
			klass.addMethods(properties[i]);
		if(!klass.prototype.initialize)
			klass.prototype.initialize = Prototype.emptyFunction;
			klass.prototype.constructor = klass;
		return klass;
	}
};

Class.Methods =
{
	addMethods: function(source)
	{
		var ancestor = this.superclass && this.superclass.prototype;
		var properties = Object.keys(source);
		if(!Object.keys({ toString: true }).length)
			properties.push("toString", "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().first() == "$super")
			{
				var method = value, value = Object.extend((function(m)
				{
					return function()
					{
						return ancestor[m].apply(this, arguments)
					};
				}
				)(property).wrap(method),
				{
					valueOf: function()
					{
						return method
					},
					toString: function()
					{
						return method.toString()
					}
				}
				);
			}
			this.prototype[property] = value;
		}
		return this;
	}
};

var Abstract = { };

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

Object.extend(Object,
{
	inspect: function(object)
	{
		try
		{
			if(Object.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;
		}
	},
	toJSON: function(object)
	{
		var type = typeof object;
		switch (type)
		{
			case 'undefined':
			case 'function':
			case 'unknown': return;
			case 'boolean': return object.toString();
		}
		if(object === null) return 'null';
		if(object.toJSON) return object.toJSON();
		if(Object.isElement(object)) return;
		var results = [];
		for(var property in object)
		{
			var value = Object.toJSON(object[property]);
			if(!Object.isUndefined(value))
				results.push(property.toJSON() + ': ' + value);
		}
		return '{' + results.join(', ') + '}';
	},
	toQueryString: function(object)
	{
		return $H(object).toQueryString();
	},
	toHTML: function(object)
	{
		return object && object.toHTML ? object.toHTML() : String.interpret(object);
	},
	keys: function(object)
	{
		var keys = [];
		for (var property in object)
			keys.push(property);
		return keys;
	},
	values: function(object)
	{
		var values = [];
		for (var property in object)
			values.push(object[property]);
		return values;
	},
	clone: function(object)
	{
		return Object.extend({ }, object);
	},
	isElement: function(object)
	{
		return object && object.nodeType == 1;
	},
	isArray: function(object)
	{
		return object != null && typeof object == "object" && 'splice' in object && 'join' in object;
	},
	isHash: function(object)
	{
		return object instanceof Hash;
	},
	isFunction: function(object)
	{
		return typeof object == "function";
	},
	isString: function(object)
	{
		return typeof object == "string";
	},
	isNumber: function(object)
	{
		return typeof object == "number";
	},
	isUndefined: function(object)
	{
		return typeof object == "undefined";
	}
}
);

Object.extend(Function.prototype,
{
	argumentNames: function()
	{
		var names = this.toString().match(/^[\s\(]*function[^(]*\((.*?)\)/)[1].split(",").invoke("strip");
		return names.length == 1 && !names[0] ? [] : names;
	},
	bind: function()
	{
		if(arguments.length < 2 && Object.isUndefined(arguments[0])) return this;
		var __method = this, args = $A(arguments), object = args.shift();
		return function()
		{
			return __method.apply(object, args.concat($A(arguments)));
		}
	},
	bindAsEventListener: function()
	{
		var __method = this, args = $A(arguments), object = args.shift();
		return function(event)
		{
			return __method.apply(object, [event || window.event].concat(args));
		}
	},
	curry: function()
	{
		if(!arguments.length) return this;
		var __method = this, args = $A(arguments);
		return function()
		{
			return __method.apply(this, args.concat($A(arguments)));
		}
	},
	delay: function()
	{
		var __method = this, args = $A(arguments), timeout = args.shift() * 1000;
		return window.setTimeout(function()
		{
			return __method.apply(__method, args);
		}, timeout);
	},
	wrap: function(wrapper)
	{
		var __method = this;
		return function()
		{
			return wrapper.apply(this, [__method.bind(this)].concat($A(arguments)));
		}
	},
	methodize: function()
	{
		if(this._methodized) return this._methodized;
		var __method = this;
		return this._methodized = function()
		{
			return __method.apply(null, [this].concat($A(arguments)));
		};
	}
}
);

Function.prototype.defer = Function.prototype.delay.curry(0.01);

Date.prototype.toJSON = function()
{
	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"';
};

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;
	}
};

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();
			}
			finally
			{
				this.currentlyExecuting = false;
			}
		}
	}
}
);
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,
{
	gsub: function(pattern, replacement)
	{
		var result = '', source = this, match;
		replacement = arguments.callee.prepareReplacement(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;
	},
	sub: function(pattern, replacement, count)
	{
		replacement = this.gsub.prepareReplacement(replacement);
		count = Object.isUndefined(count) ? 1 : count;
		return this.gsub(pattern, function(match)
		{
			if(--count < 0) return match[0];
				return replacement(match);
		}
		);
	},
	scan: function(pattern, iterator)
	{
		this.gsub(pattern, iterator);
		return String(this);
	},
	truncate: function(length, truncation)
	{
		length = length || 30;
		truncation = Object.isUndefined(truncation) ? '...' : truncation;
		return this.length > length ?
		this.slice(0, length - truncation.length) + truncation : String(this);
	},
	strip: function()
	{
		return this.replace(/^\s+/, '').replace(/\s+$/, '');
	},
	stripTags: function()
	{
		return this.replace(/<\/?[^>]+>/gi, '');
	},
	stripScripts: function()
	{
		return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');
	},
	extractScripts: function()
	{
		var matchAll = new RegExp(Prototype.ScriptFragment, 'img');
		var matchOne = new RegExp(Prototype.ScriptFragment, 'im');
		return (this.match(matchAll) || []).map(function(scriptTag)
		{
			return (scriptTag.match(matchOne) || ['', ''])[1];
		}
		);
	},
	evalScripts: function()
	{
		return this.extractScripts().map(function(script) { return eval(script) });
	},
	escapeHTML: function()
	{
		var self = arguments.callee;
		self.text.data = this;
		return self.div.innerHTML;
	},
	unescapeHTML: function()
	{
		var div = new Element('div');
		div.innerHTML = this.stripTags();
		return div.childNodes[0] ? (div.childNodes.length > 1 ?
		$A(div.childNodes).inject('', function(memo, node) { return memo+node.nodeValue }) : div.childNodes[0].nodeValue) : '';
	},
	toQueryParams: function(separator)
	{
		var match = this.strip().match(/([^?#]*)(#.*)?$/);
		if(!match) return { };
		return match[1].split(separator || '&').inject({ }, function(hash, pair)
		{
			if((pair = pair.split('='))[0])
			{
				var key = decodeURIComponent(pair.shift());
				var 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;
		}
		);
	},
	toArray: function()
	{
		return this.split('');
	},
	succ: function()
	{
		return this.slice(0, this.length - 1) + String.fromCharCode(this.charCodeAt(this.length - 1) + 1);
	},
	times: function(count)
	{
		return count < 1 ? '' : new Array(count + 1).join(this);
	},
	camelize: function()
	{
		var parts = this.split('-'), len = parts.length;
		if(len == 1) return parts[0];
		var camelized = this.charAt(0) == '-' ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1) : parts[0];
		for(var i = 1; i < len; i++)
			camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);
		return camelized;
	},
	capitalize: function()
	{
		return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();
	},
	underscore: function()
	{
		return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();
	},
	dasherize: function()
	{
		return this.gsub(/_/,'-');
	},
	inspect: function(useDoubleQuotes)
	{
		var escapedString = this.gsub(/[\x00-\x1f\\]/, function(match)
		{
			var character = String.specialChar[match[0]];
			return character ? character : '\\u00' + match[0].charCodeAt().toPaddedString(2, 16);
		}
		);
		if(useDoubleQuotes) return '"' + escapedString.replace(/"/g, '\\"') + '"';
			return "'" + escapedString.replace(/'/g, '\\\'') + "'";
	},
	toJSON: function()
	{
		return this.inspect(true);
	},
	unfilterJSON: function(filter)
	{
		return this.sub(filter || Prototype.JSONFilter, '#{1}');
	},
	isJSON: function()
	{
		var str = this;
		if(str.blank()) return false;
		str = this.replace(/\\./g, '@').replace(/"[^"\\\n\r]*"/g, '');
		return (/^[,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]*$/).test(str);
	},
	evalJSON: function(sanitize)
	{
		var json = this.unfilterJSON();
		try
		{
			if(!sanitize || json.isJSON()) return eval('(' + json + ')');
		}
		catch (e){ }
		throw new SyntaxError('Badly formed JSON string: ' + this.inspect());
	},
	include: function(pattern)
	{
		return this.indexOf(pattern) > -1;
	},
	startsWith: function(pattern)
	{
		return this.indexOf(pattern) === 0;
	},
	endsWith: function(pattern)
	{
		var d = this.length - pattern.length;
		return d >= 0 && this.lastIndexOf(pattern) === d;
	},
	empty: function()
	{
		return this == '';
	},
	blank: function()
	{
		return /^\s*$/.test(this);
	},
	interpolate: function(object, pattern)
	{
		return new Template(this, pattern).evaluate(object);
	}
}
);

if(Prototype.Browser.WebKit || Prototype.Browser.IE) Object.extend(String.prototype,
{
	escapeHTML: function()
	{
		return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
	},
	unescapeHTML: function()
	{
		return this.replace(/&amp;/g,'&').replace(/&lt;/g,'<').replace(/&gt;/g,'>');
	}
}
);

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

String.prototype.parseQuery = String.prototype.toQueryParams;

Object.extend(String.prototype.escapeHTML,
{
	div:  document.createElement('div'),
	text: document.createTextNode('')
}
);

with (String.prototype.escapeHTML) div.appendChild(text);

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

evaluate: function(object)
{
	if(Object.isFunction(object.toTemplateReplacements))
    	object = object.toTemplateReplacements();
		return this.template.gsub(this.pattern, function(match)
		{
			if(object == null) return '';
			var before = match[1] || '';
			if(before == '\\') return match[2];
			var ctx = object, expr = match[3];
			var pattern = /^([^.[]+|\[((?:.*?[^\\])?)\])(\.|\[|$)/;
			match = pattern.exec(expr);
			if(match == null) return before;
			while (match != null)
			{
				var comp = match[1].startsWith('[') ? match[2].gsub('\\\\]', ']') : 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 =
{
	each: function(iterator, context)
	{
		var index = 0;
		iterator = iterator.bind(context);
		try
		{
			this._each(function(value)
			{
				iterator(value, index++);
			}
			);
		}
		catch (e)
		{
			if(e != $break) throw e;
		}
		return this;
	},
	eachSlice: function(number, iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var index = -number, slices = [], array = this.toArray();
		while ((index += number) < array.length)
			slices.push(array.slice(index, index+number));
		return slices.collect(iterator, context);
	},

	all: function(iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var result = true;
		this.each(function(value, index)
		{
			result = result && !!iterator(value, index);
			if(!result) throw $break;
		}
		);
		return result;
	},
	any: function(iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var result = false;
		this.each(function(value, index)
		{
			if(result = !!iterator(value, index))
				throw $break;
			}
			);
		return result;
	},
	collect: function(iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var results = [];
		this.each(function(value, index)
		{
			results.push(iterator(value, index));
		}
		);
		return results;
	},
	detect: function(iterator, context)
	{
		iterator = iterator.bind(context);
		var result;
		this.each(function(value, index)
		{
			if(iterator(value, index))
			{
				result = value;
				throw $break;
			}
		}
		);
		return result;
	},
	findAll: function(iterator, context)
	{
		iterator = iterator.bind(context);
		var results = [];
		this.each(function(value, index)
		{
			if(iterator(value, index))
				results.push(value);
		}
		);
		return results;
	},
	grep: function(filter, iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var results = [];
		if(Object.isString(filter))
		filter = new RegExp(filter);
		this.each(function(value, index)
		{
			if(filter.match(value))
				results.push(iterator(value, index));
		}
		);
		return results;
	},
	include: function(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;
	},
	inGroupsOf: function(number, fillWith)
	{
		fillWith = Object.isUndefined(fillWith) ? null : fillWith;
		return this.eachSlice(number, function(slice)
		{
			while(slice.length < number) slice.push(fillWith);
			return slice;
		}
	);
	},
	inject: function(memo, iterator, context)
	{
		iterator = iterator.bind(context);
		this.each(function(value, index)
		{
			memo = iterator(memo, value, index);
		}
		);
		return memo;
	},
	invoke: function(method)
	{
		var args = $A(arguments).slice(1);
		return this.map(function(value)
		{
			return value[method].apply(value, args);
		}
		);
	},
	max: function(iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var result;
		this.each(function(value, index)
		{
			value = iterator(value, index);
			if(result == null || value >= result)
				result = value;
		}
		);
	return result;
	},
	min: function(iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var result;
		this.each(function(value, index)
		{
			value = iterator(value, index);
			if(result == null || value < result)
				result = value;
		}
		);
		return result;
	},
	partition: function(iterator, context)
	{
		iterator = iterator ? iterator.bind(context) : Prototype.K;
		var trues = [], falses = [];
		this.each(function(value, index)
		{
			(iterator(value, index) ? trues : falses).push(value);
		}
		);
		return [trues, falses];
	},
	pluck: function(property)
	{
		var results = [];
		this.each(function(value)
		{
			results.push(value[property]);
		}
		);
		return results;
	},
	reject: function(iterator, context)
	{
		iterator = iterator.bind(context);
		var results = [];
		this.each(function(value, index)
		{
			if(!iterator(value, index))
				results.push(value);
		}
		);
		return results;
	},
	sortBy: function(iterator, context)
	{
		iterator = iterator.bind(context);
		return this.map(function(value, index)
		{
			return{value: value, criteria: iterator(value, index)};
		}
		).sort(function(left, right)
		{
			var a = left.criteria, b = right.criteria;
			return a < b ? -1 : a > b ? 1 : 0;
		}
		).pluck('value');
	},
	toArray: function()
	{
		return this.map();
	},
	zip: function()
	{
		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));
		}
		);
	},
	size: function()
	{
		return this.toArray().length;
	},
	inspect: function()
	{
		return '#<Enumerable:' + this.toArray().inspect() + '>';
	}
};

Object.extend(Enumerable,
{
	map: Enumerable.collect,
	find: Enumerable.detect,
	select: Enumerable.findAll,
	filter: Enumerable.findAll,
	member: Enumerable.include,
	entries: Enumerable.toArray,
	every: Enumerable.all,
	some: Enumerable.any
}
);
function $A(iterable)
{
	if(!iterable) return [];
	if(iterable.toArray) return iterable.toArray();
	var length = iterable.length || 0, results = new Array(length);
	while(length--) results[length] = iterable[length];
	return results;
}
if(Prototype.Browser.WebKit)
{
	$A = function(iterable)
	{
		if(!iterable) return [];
		if(!(Object.isFunction(iterable) && iterable == '[object NodeList]') && iterable.toArray) return iterable.toArray();
		var length = iterable.length || 0, results = new Array(length);
		while (length--) results[length] = iterable[length];
		return results;
	};
}
Array.from = $A;

Object.extend(Array.prototype, Enumerable);

if(!Array.prototype._reverse) Array.prototype._reverse = Array.prototype.reverse;

Object.extend(Array.prototype,
{
	_each: function(iterator)
	{
		for(var i = 0, length = this.length; i < length; i++)
			iterator(this[i]);
	},
	clear: function()
	{
		this.length = 0;
		return this;
	},
	first: function()
	{
		return this[0];
	},
	last: function()
	{
		return this[this.length - 1];
	},
	compact: function()
	{
		return this.select(function(value)
		{
			return value != null;
		}
		);
	},
	flatten: function()
	{
		return this.inject([], function(array, value)
		{
			return array.concat(Object.isArray(value) ? value.flatten() : [value]);
		}
		);
	},
	without: function()
	{
		var values = $A(arguments);
		return this.select(function(value)
		{
			return !values.include(value);
		}
		);
	},
	reverse: function(inline)
	{
		return (inline !== false ? this : this.toArray())._reverse();
	},
	reduce: function()
	{
		return this.length > 1 ? this : this[0];
	},
	uniq: function(sorted)
	{
		return this.inject([], function(array, value, index)
		{
			if (0 == index || (sorted ? array.last() != value : !array.include(value)))
				array.push(value);
			return array;
		}
		);
	},
	intersect: function(array)
	{
		return this.uniq().findAll(function(item)
		{
			return array.detect(function(value) { return item === value });
		}
		);
	},
	clone: function()
	{
		return [].concat(this);
	},
	size: function()
	{
		return this.length;
	},
	inspect: function()
	{
		return '[' + this.map(Object.inspect).join(', ') + ']';
	},
	toJSON: function()
	{
		var results = [];
		this.each(function(object)
		{
			var value = Object.toJSON(object);
			if(!Object.isUndefined(value)) results.push(value);
		}
		);
		return '[' + results.join(', ') + ']';
	}
}
);

if(Object.isFunction(Array.prototype.forEach))
	Array.prototype._each = Array.prototype.forEach;

if(!Array.prototype.indexOf) Array.prototype.indexOf = function(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;
};

if(!Array.prototype.lastIndexOf) Array.prototype.lastIndexOf = function(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;
};

Array.prototype.toArray = Array.prototype.clone;

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

if(Prototype.Browser.Opera)
{
	Array.prototype.concat = function()
	{
		var array = [];
		for(var i = 0, length = this.length; i < length; i++) array.push(this[i]);
		for(var i = 0, length = arguments.length; i < length; i++)
		{
			if(Object.isArray(arguments[i]))
			{
				for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)
					array.push(arguments[i][j]);
			}
			else
			{
				array.push(arguments[i]);
			}
		}
		return array;
	};
}
Object.extend(Number.prototype,
{
	toColorPart: function()
	{
		return this.toPaddedString(2, 16);
	},
	succ: function()
	{
		return this + 1;
	},
	times: function(iterator)
	{
		$R(0, this, true).each(iterator);
		return this;
	},
	toPaddedString: function(length, radix)
	{
		var string = this.toString(radix || 10);
		return '0'.times(length - string.length) + string;
	},
	toJSON: function()
	{
		return isFinite(this) ? this.toString() : 'null';
	}
}
);

$w('abs round ceil floor').each(function(method)
{
	Number.prototype[method] = Math[method].methodize();
}
);
function $H(object)
{
	return new Hash(object);
};

var Hash = Class.create(Enumerable, (function()
{
	function toQueryPair(key, value)
	{
		if(Object.isUndefined(value)) return key;
		return key + '=' + encodeURIComponent(String.interpret(value));
	}
	return{initialize: function(object)
		{
			this._object = Object.isHash(object) ? object.toObject() : Object.clone(object);
		},
		_each: function(iterator)
		{
			for(var key in this._object)
			{
				var value = this._object[key], pair = [key, value];
				pair.key = key;
				pair.value = value;
				iterator(pair);
			}
		},
		set: function(key, value)
		{
			return this._object[key] = value;
		},
		get: function(key)
		{
			return this._object[key];
		},
		unset: function(key)
		{
			var value = this._object[key];
			delete this._object[key];
			return value;
		},
		toObject: function()
		{
			return Object.clone(this._object);
		},
		keys: function()
		{
			return this.pluck('key');
		},
		values: function()
		{
			return this.pluck('value');
		},
		index: function(value)
		{
			var match = this.detect(function(pair)
			{
				return pair.value === value;
			}
			);
			return match && match.key;
		},
		merge: function(object)
		{
			return this.clone().update(object);
		},
		update: function(object)
		{
			return new Hash(object).inject(this, function(result, pair)
			{
				result.set(pair.key, pair.value);
				return result;
			}
			);
		},
		toQueryString: function()
		{
			return this.map(function(pair)
			{
				var key = encodeURIComponent(pair.key), values = pair.value;
				if(values && typeof values == 'object')
				{
					if(Object.isArray(values))
					return values.map(toQueryPair.curry(key)).join('&');
				}
				return toQueryPair(key, values);
			}
			).join('&');
		},
		inspect: function()
		{
			return '#<Hash:{' + this.map(function(pair)
			{
				return pair.map(Object.inspect).join(': ');
			}
			).join(', ') + '}>';
		},
		toJSON: function()
		{
			return Object.toJSON(this.toObject());
		},
		clone: function()
		{
			return new Hash(this);
		}
	}
}
)
());

Hash.prototype.toTemplateReplacements = Hash.prototype.toObject;
Hash.from = $H;
var ObjectRange = Class.create(Enumerable,
{
	initialize: function(start, end, exclusive)
	{
		this.start = start;
		this.end = end;
		this.exclusive = exclusive;
	},
	_each: function(iterator)
	{
		var value = this.start;
		while(this.include(value))
		{
			iterator(value);
			value = value.succ();
		}
	},
	include: function(value)
	{
		if(value < this.start)
			return false;
		if(this.exclusive)
			return value < this.end;
			return value <= this.end;
	}
}
);

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

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.isString(this.options.parameters))
			this.options.parameters = this.options.parameters.toQueryParams();
		else 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.clone(this.options.parameters);
		if(!['get', 'post'].include(this.method))
		{
			params['_method'] = this.method;
			this.method = 'post';
		}
		this.parameters = params;
		if(params = Object.toQueryString(params))
		{
			if(this.method == 'get')
			this.url += (this.url.include('?') ? '&' : '?') + params;
			else if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))
			params += '&_=';
		}
		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);
			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 : '');
			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
				$H(extras).each(function(pair) { headers[pair.key] = pair.value });
		}
		for(var name in headers)
			this.transport.setRequestHeader(name, headers[name]);
	},
	success: function()
	{
		var status = this.getStatus();
		return !status || (status >= 200 && status < 300);
	},
	getStatus: function()
	{
		try
		{
			return this.transport.status || 0;
		}
		catch (e) { return 0 }
	},
	respondToReadyState: function(readyState)
	{
		var state = Ajax.Request.Events[readyState], response = new Ajax.Response(this);
		if(state == 'Complete')
		{
			try
			{
				this._complete = true;
				(this.options['on' + response.status] || this.options['on' + (this.success() ? 'Success' : 'Failure')] || Prototype.emptyFunction)(response, response.headerJSON);
			}
			catch (e)
			{
				this.dispatchException(e);
			}
			var contentType = response.getHeader('Content-type');
			if(this.options.evalJS == 'force' || (this.options.evalJS && this.isSameOrigin() && contentType && contentType.match(/^\s*(text|application)\/(x-)?(java|ecma)script(;.*)?\s*$/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(!window.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()
{
	var element = this.Element;
	this.Element = function(tagName, attributes)
	{
		attributes = attributes || { };
		tagName = tagName.toLowerCase();
		var cache = Element.cache;
		if(Prototype.Browser.IE && 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));
		return Element.writeAttribute(cache[tagName].cloneNode(false), attributes);
	};
	Object.extend(this.Element, element || { });
}
).call(window);

Element.cache = { };

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).style.display = 'none';
		return element;
	},
	show: function(element)
	{
		$(element).style.display = '';
		return element;
	},
	remove: function(element)
	{
		element = $(element);
		element.parentNode.removeChild(element);
		return element;
	},
	update: function(element, content)
	{
		element = $(element);
		if(content && content.toElement) content = content.toElement();
		if(Object.isElement(content)) return element.update().insert(content);
		content = Object.toHTML(content);
		element.innerHTML = content.stripScripts();
		content.evalScripts.bind(content).defer();
		return element;
	},
	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();
			var value = (element[property] || '').toString();
			if(value) result += ' ' + attribute + '=' + value.inspect(true);
		}
		);
		return result + '>';
	},
	recursivelyCollect: function(element, property)
	{
		element = $(element);
		var elements = [];
		while(element = element[property])
		if(element.nodeType == 1)
			elements.push(Element.extend(element));
		return elements;
	},
	ancestors: function(element)
	{
		return $(element).recursivelyCollect('parentNode');
	},
	descendants: function(element)
	{
		return $(element).select("*");
	},
	firstDescendant: function(element)
	{
		element = $(element).firstChild;
		while(element && element.nodeType != 1) element = element.nextSibling;
		return $(element);
	},
	immediateDescendants: function(element)
	{
		if(!(element = $(element).firstChild)) return [];
		while(element && element.nodeType != 1) element = element.nextSibling;
		if(element) return [element].concat($(element).nextSiblings());
		return [];
	},
	previousSiblings: function(element)
	{
		return $(element).recursivelyCollect('previousSibling');
	},
	nextSiblings: function(element)
	{
		return $(element).recursivelyCollect('nextSibling');
	},
	siblings: function(element)
	{
		element = $(element);
		return element.previousSiblings().reverse().concat(element.nextSiblings());
	},
	match: function(element, selector)
	{
		if(Object.isString(selector))
			selector = new Selector(selector);
		return selector.match($(element));
	},
	up: function(element, expression, index)
	{
		element = $(element);
		if(arguments.length == 1) return $(element.parentNode);
		var ancestors = element.ancestors();
		return Object.isNumber(expression) ? ancestors[expression] : Selector.findElement(ancestors, expression, index);
	},
	down: function(element, expression, index)
	{
		element = $(element);
		if(arguments.length == 1) return element.firstDescendant();
		return Object.isNumber(expression) ? element.descendants()[expression] : element.select(expression)[index || 0];
	},
	previous: function(element, expression, index)
	{
		element = $(element);
		if(arguments.length == 1) return $(Selector.handlers.previousElementSibling(element));
		var previousSiblings = element.previousSiblings();
		return Object.isNumber(expression) ? previousSiblings[expression] : Selector.findElement(previousSiblings, expression, index);
	},
	next: function(element, expression, index)
	{
		element = $(element);
		if(arguments.length == 1) return $(Selector.handlers.nextElementSibling(element));
		var nextSiblings = element.nextSiblings();
		return Object.isNumber(expression) ? nextSiblings[expression] : Selector.findElement(nextSiblings, expression, index);
	},
	select: function()
	{
		var args = $A(arguments), element = $(args.shift());
		return Selector.findChildElements(element, args);
	},
	adjacent: function()
	{
		var args = $A(arguments), element = $(args.shift());
		return Selector.findChildElements(element.parentNode, args).without(element);
	},
	identify: function(element)
	{
		element = $(element);
		var id = element.readAttribute('id'), self = arguments.callee;
		if(id) return id;
		do
		{
			id = 'anonymous_element_' + self.counter++
		}
		while($(id));
		element.writeAttribute('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().height;
	},
	getWidth: function(element)
	{
		return $(element).getDimensions().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(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(className) ? 'removeClassName' : 'addClassName'](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);
		var originalAncestor = ancestor;
		if(element.compareDocumentPosition)
			return(element.compareDocumentPosition(ancestor) & 8) === 8;
		if(element.sourceIndex && !Prototype.Browser.Opera)
		{
			var e = element.sourceIndex, a = ancestor.sourceIndex,
			nextAncestor = ancestor.nextSibling;
			if(!nextAncestor)
			{
				do 
				{
					ancestor = ancestor.parentNode;
				}
				while(!(nextAncestor = ancestor.nextSibling) && ancestor.parentNode);
			}
			if(nextAncestor && nextAncestor.sourceIndex)
				return (e > a && e < nextAncestor.sourceIndex);
		}
		while(element = element.parentNode)
			if(element == originalAncestor) return true;
		return false;
	},

	scrollTo: function(element)
	{
		element = $(element);
		var pos = element.cumulativeOffset();
		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)
		{
			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;
	},
	getDimensions: function(element)
	{
		element = $(element);
		var display = $(element).getStyle('display');
		if(display != 'none' && display != null)
		return{
			width: element.offsetWidth, height: element.offsetHeight
		};
		var els = element.style;
		var originalVisibility = els.visibility;
		var originalPosition = els.position;
		var originalDisplay = els.display;
		els.visibility = 'hidden';
		els.position = 'absolute';
		els.display = 'block';
		var originalWidth = element.clientWidth;
		var originalHeight = element.clientHeight;
		els.display = originalDisplay;
		els.position = originalPosition;
		els.visibility = originalVisibility;
		return{
			width: originalWidth, height: originalHeight
		};
	},
	makePositioned: function(element)
	{
		element = $(element);
		var pos = Element.getStyle(element, 'position');
		if(pos == 'static' || !pos)
		{
			element._madePositioned = true;
			element.style.position = 'relative';
			if(window.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;
	},
	cumulativeOffset: function(element)
	{
		var valueT = 0, valueL = 0;
		do
		{
			valueT += element.offsetTop  || 0;
			valueL += element.offsetLeft || 0;
			element = element.offsetParent;
		}
		while (element);
		return Element._returnOffset(valueL, valueT);
	},
	positionedOffset: function(element)
	{
		var valueT = 0, valueL = 0;
		do
		{
			valueT += element.offsetTop  || 0;
			valueL += element.offsetLeft || 0;
			element = element.offsetParent;
			if(element)
			{
				if(element.tagName == 'BODY') break;
				var p = Element.getStyle(element, 'position');
				if(p !== 'static') break;
			}
		}
		while (element);
		return Element._returnOffset(valueL, valueT);
	},
	absolutize: function(element)
	{
		element = $(element);
		if(element.getStyle('position') == 'absolute') return;

		var offsets = element.positionedOffset();
		var top = offsets[1];
		var left = offsets[0];
		var width = element.clientWidth;
		var height = element.clientHeight;

		element._originalLeft = left - parseFloat(element.style.left  || 0);
		element._originalTop = top  - parseFloat(element.style.top || 0);
		element._originalWidth = element.style.width;
		element._originalHeight = element.style.height;

		element.style.position = 'absolute';
		element.style.top = top + 'px';
		element.style.left = left + 'px';
		element.style.width = width + 'px';
		element.style.height = height + 'px';
		return element;
	},
	relativize: function(element)
	{
		element = $(element);
		if(element.getStyle('position') == 'relative') return;

		element.style.position = 'relative';
		var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);
		var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

		element.style.top = top + 'px';
		element.style.left = left + 'px';
		element.style.height = element._originalHeight;
		element.style.width = element._originalWidth;
		return element;
	},
	cumulativeScrollOffset: function(element)
	{
		var valueT = 0, valueL = 0;
		do
		{
			valueT += element.scrollTop  || 0;
			valueL += element.scrollLeft || 0;
			element = element.parentNode;
		}
		while (element);
		return Element._returnOffset(valueL, valueT);
	},
	getOffsetParent: function(element)
	{
		if(element.offsetParent) return $(element.offsetParent);
		if(element == document.body) return $(element);
		while((element = element.parentNode) && element != document.body)
		if(Element.getStyle(element, 'position') != 'static')
		return $(element);
		return $(document.body);
	},
	viewportOffset: function(forElement)
	{
		var valueT = 0, valueL = 0;
		var element = forElement;
		do
		{
			valueT += element.offsetTop  || 0;
			valueL += element.offsetLeft || 0;
			if(element.offsetParent == document.body && Element.getStyle(element, 'position') == 'absolute') break;
		}
		while (element = element.offsetParent);
		element = forElement;
		do
		{
			if(!Prototype.Browser.Opera || element.tagName == 'BODY')
			{
				valueT -= element.scrollTop  || 0;
				valueL -= element.scrollLeft || 0;
			}
		}
		while(element = element.parentNode);
		return Element._returnOffset(valueL, valueT);
	},
	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 = source.viewportOffset();
		element = $(element);
		var delta = [0, 0];
		var parent = null;
		if(Element.getStyle(element, 'position') == 'absolute')
		{
			parent = element.getOffsetParent();
			delta = parent.viewportOffset();
		}
		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;
	}
};

Element.Methods.identify.counter = 1;

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 'left': case 'top': case 'right': case 'bottom':
			if(proceed(element, 'position') === 'static') return null;
			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.getOffsetParent = Element.Methods.getOffsetParent.wrap(
	function(proceed, element)
	{
		element = $(element);
		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;
	}
	);
	$w('positionedOffset viewportOffset').each(function(method)
	{
		Element.Methods[method] = Element.Methods[method].wrap(
		function(proceed, element)
		{
			element = $(element);
			var position = element.getStyle('position');
			if(position !== 'static') return proceed(element);
			var offsetParent = element.getOffsetParent();
			if(offsetParent && offsetParent.getStyle('position') === 'fixed')
			offsetParent.setStyle({ zoom: 1 });
			element.setStyle({ position: 'relative' });
			var value = proceed(element);
			element.setStyle({ position: position });
			return value;
		}
		);
	}
	);

	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 =
	{
		read:
		{
			names:
			{
				'class': 'className', 'for': 'htmlFor'
			},
			values:
			{
				_getAttr: function(element, attribute)
				{
					return element.getAttribute(attribute, 2);
				},
				_getAttrNode: function(element, attribute)
				{
					var node = element.getAttributeNode(attribute);
					return node ? node.value : "";
				},
				_getEv: function(element, attribute)
				{
					attribute = element.getAttribute(attribute);
					return attribute ? attribute.toString().slice(23, -2) : null;
				},
				_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').each(function(attr)
	{
		Element._attributeTranslations.write.names[attr.toLowerCase()] = attr;
		Element._attributeTranslations.has[attr.toLowerCase()] = attr;
	}
	);
	(function(v)
	{
		Object.extend(v,
		{
			href: v._getAttr,
			src: v._getAttr,
			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);
}

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 == 'IMG' && element.width)
		{
			element.width++; element.width--;
		}
		else try
		{
			var n = document.createTextNode(' ');
			element.appendChild(n);
			element.removeChild(n);
		}
		catch (e){ }
		return element;
	};
	Element.Methods.cumulativeOffset = function(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 Element._returnOffset(valueL, valueT);
	};
}

if(Prototype.Browser.IE || Prototype.Browser.Opera)
{
	Element.Methods.update = function(element, content)
	{
		element = $(element);
		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 in Element._insertionTranslations.tags)
		{
			$A(element.childNodes).each(function(node) { element.removeChild(node) });
			Element._getContentFromAnonymousElement(tagName, content.stripScripts())
			.each(function(node) { element.appendChild(node) });
		}
		else element.innerHTML = content.stripScripts();
			content.evalScripts.bind(content).defer();
		return element;
	};
}

if('outerHTML' in document.createElement('div'))
{
	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();
			var 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)
{
	var div = new Element('div'), t = Element._insertionTranslations.tags[tagName];
	if(t)
	{
		div.innerHTML = t[0] + html + t[1];
		t[2].times(function() { 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()
{
	Object.extend(this.tags,
	{
		THEAD: this.tags.TBODY, TFOOT: this.tags.TBODY, TH: this.tags.TD
	}
	);
}
).call(Element._insertionTranslations);

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);

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

Element.extend = (function()
{
	if(Prototype.BrowserFeatures.SpecificElementExtensions)
		return Prototype.K;
	var Methods = { }, ByTag = Element.Methods.ByTag;
	var extend = Object.extend(function(element)
	{
		if(!element || element._extendedByPrototype || element.nodeType != 1 || element == window) return element;
		var methods = Object.clone(Methods), tagName = element.tagName, property, value;
		if(ByTag[tagName]) Object.extend(methods, ByTag[tagName]);
		for(property in methods)
		{
			value = methods[property];
			if(Object.isFunction(value) && !(property in element))
				element[property] = value.methodize();
		}
		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;
}
)();

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

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)
		}
		);
	}
	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];
		window[klass] = { };
		window[klass].prototype = document.createElement(tagName).__proto__;
		return window[klass];
	}
	if(F.ElementExtensions)
	{
		copy(Element.Methods, HTMLElement.prototype);
		copy(Element.Methods.Simulated, HTMLElement.prototype, 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()
	{
		var dimensions = { };
		var B = Prototype.Browser;
		$w('width height').each(function(d)
		{
			var D = d.capitalize();
			dimensions[d] = (B.WebKit && !document.evaluate) ? self['inner' + D] :
			(B.Opera) ? document.body['client' + D] : document.documentElement['client' + D];
		}
		);
		return dimensions;
	},
	getWidth: function()
	{
		return this.getDimensions().width;
	},
	getHeight: function()
	{
		return this.getDimensions().height;
	},
	getScrollOffsets: function()
	{
		return Element._returnOffset(
		window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft,
		window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop);
	}
};

var Selector = Class.create(
{
	initialize: function(expression)
	{
		this.expression = expression.strip();
		this.compileMatcher();
	},
	shouldUseXPath: function()
	{
		if(!Prototype.BrowserFeatures.XPath) return false;
		var e = this.expression;
		if (Prototype.Browser.WebKit && (e.include("-of-type") || e.include(":empty")))
			return false;
		if((/(\[[\w-]*?:|:checked)/).test(this.expression))
			return false;
		return true;
	},
	compileMatcher: function()
	{
		if(this.shouldUseXPath())
			return this.compileXPathMatcher();
		var e = this.expression, ps = Selector.patterns, h = Selector.handlers, c = Selector.criteria, le, p, m;
		if(Selector._cache[e])
		{
			this.matcher = Selector._cache[e];
			return;
		}
		this.matcher = ["this.matcher = function(root) {", "var r = root, h = Selector.handlers, c = false, n;"];
		while(e && le != e && (/\S/).test(e))
		{
			le = e;
			for(var i in ps)
			{
				p = ps[i];
				if(m = e.match(p))
				{
					this.matcher.push(Object.isFunction(c[i]) ? c[i](m) : new Template(c[i]).evaluate(m));
					e = e.replace(m[0], '');
					break;
				}
			}
		}
		this.matcher.push("return h.unique(n);\n}");
		eval(this.matcher.join('\n'));
		Selector._cache[this.expression] = this.matcher;
	},
	compileXPathMatcher: function()
	{
		var e = this.expression, ps = Selector.patterns,
		x = Selector.xpath, le, m;
		if(Selector._cache[e])
		{
			this.xpath = Selector._cache[e]; return;
		}
		this.matcher = ['.//*'];
		while(e && le != e && (/\S/).test(e))
		{
			le = e;
			for(var i in ps)
			{
				if(m = e.match(ps[i]))
				{
					this.matcher.push(Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m));
					e = e.replace(m[0], '');
					break;
				}
			}
		}
		this.xpath = this.matcher.join('');
		Selector._cache[this.expression] = this.xpath;
	},
	findElements: function(root)
	{
		root = root || document;
		if(this.xpath) return document._getElementsByXPath(this.xpath, root);
			return this.matcher(root);
	},
	match: function(element)
	{
		this.tokens = [];
		var e = this.expression, ps = Selector.patterns, as = Selector.assertions;
		var le, p, m;
		while (e && le !== e && (/\S/).test(e))
		{
			le = e;
			for(var i in ps)
			{
				p = ps[i];
				if(m = e.match(p))
				{
					if(as[i])
					{
						this.tokens.push([i, Object.clone(m)]);
						e = e.replace(m[0], '');
					}
					else
					{
						return this.findElements(document).include(element);
					}
				}
			}
		}
		var match = true, name, matches;
		for(var i = 0, token; token = this.tokens[i]; i++)
		{
			name = token[0], matches = token[1];
			if(!Selector.assertions[name](element, matches))
			{
				match = false; break;
			}
		}
		return match;
	},
	toString: function()
	{
		return this.expression;
	},
	inspect: function()
	{
		return "#<Selector:" + this.expression.inspect() + ">";
	}
}
);

Object.extend(Selector,
{
	_cache: { },
	xpath:
	{
		descendant: "//*",
		child: "/*",
		adjacent: "/following-sibling::*[1]",
		laterSibling: '/following-sibling::*',
		tagName: function(m)
		{
			if(m[1] == '*') return '';
			return "[local-name()='" + m[1].toLowerCase() + "' or local-name()='" + m[1].toUpperCase() + "']";
		},
		className: "[contains(concat(' ', @class, ' '), ' #{1} ')]",
		id: "[@id='#{1}']",
		attrPresence: function(m)
		{
			m[1] = m[1].toLowerCase();
			return new Template("[@#{1}]").evaluate(m);
		},
		attr: function(m)
		{
			m[1] = m[1].toLowerCase();
			m[3] = m[5] || m[6];
			return new Template(Selector.xpath.operators[m[2]]).evaluate(m);
		},
		pseudo: function(m)
		{
			var h = Selector.xpath.pseudos[m[1]];
			if(!h) return '';
			if(Object.isFunction(h)) return h(m);
			return new Template(Selector.xpath.pseudos[m[1]]).evaluate(m);
		},
		operators:
		{
			'=':  "[@#{1}='#{3}']",
			'!=': "[@#{1}!='#{3}']",
			'^=': "[starts-with(@#{1}, '#{3}')]",
			'$=': "[substring(@#{1}, (string-length(@#{1}) - string-length('#{3}') + 1))='#{3}']",
			'*=': "[contains(@#{1}, '#{3}')]",
			'~=': "[contains(concat(' ', @#{1}, ' '), ' #{3} ')]",
			'|=': "[contains(concat('-', @#{1}, '-'), '-#{3}-')]"
		},
		pseudos:
		{
			'first-child': '[not(preceding-sibling::*)]',
			'last-child': '[not(following-sibling::*)]',
			'only-child': '[not(preceding-sibling::* or following-sibling::*)]',
			'empty': "[count(*) = 0 and (count(text()) = 0 or translate(text(), ' \t\r\n', '') = '')]",
			'checked': "[@checked]",
			'disabled': "[@disabled]",
			'enabled': "[not(@disabled)]",
			'not': function(m)
			{
				var e = m[6], p = Selector.patterns,
				x = Selector.xpath, le, v;
				var exclusion = [];
				while(e && le != e && (/\S/).test(e))
				{
					le = e;
					for(var i in p)
					{
						if(m = e.match(p[i]))
						{
							v = Object.isFunction(x[i]) ? x[i](m) : new Template(x[i]).evaluate(m);
							exclusion.push("(" + v.substring(1, v.length - 1) + ")");
							e = e.replace(m[0], '');
							break;
						}
					}
				}
				return "[not(" + exclusion.join(" and ") + ")]";
			},
			'nth-child': function(m)
			{
				return Selector.xpath.pseudos.nth("(count(./preceding-sibling::*) + 1) ", m);
			},
			'nth-last-child': function(m)
			{
				return Selector.xpath.pseudos.nth("(count(./following-sibling::*) + 1) ", m);
			},
			'nth-of-type': function(m)
			{
				return Selector.xpath.pseudos.nth("position() ", m);
			},
			'nth-last-of-type': function(m)
			{
				return Selector.xpath.pseudos.nth("(last() + 1 - position()) ", m);
			},
			'first-of-type': function(m)
			{
				m[6] = "1"; return Selector.xpath.pseudos['nth-of-type'](m);
			},
			'last-of-type': function(m)
			{
				m[6] = "1"; return Selector.xpath.pseudos['nth-last-of-type'](m);
			},
			'only-of-type': function(m)
			{
				var p = Selector.xpath.pseudos; return p['first-of-type'](m) + p['last-of-type'](m);
			},
			nth: function(fragment, m)
			{
				var mm, formula = m[6], predicate;
				if(formula == 'even') formula = '2n+0';
				if(formula == 'odd') formula = '2n+1';
				if(mm = formula.match(/^(\d+)$/))
					return '[' + fragment + "= " + mm[1] + ']';
				if(mm = formula.match(/^(-?\d*)?n(([+-])(\d+))?/))
				{
					if(mm[1] == "-") mm[1] = -1;
					var a = mm[1] ? Number(mm[1]) : 1;
					var b = mm[2] ? Number(mm[2]) : 0;
					predicate = "[((#{fragment} - #{b}) mod #{a} = 0) and " + "((#{fragment} - #{b}) div #{a} >= 0)]";
					return new Template(predicate).evaluate(
					{
						fragment: fragment, a: a, b: b });
					}
				}
			}
		},
		criteria:
		{
			tagName: 'n = h.tagName(n, r, "#{1}", c); c = false;',
			className: 'n = h.className(n, r, "#{1}", c); c = false;',
			id: 'n = h.id(n, r, "#{1}", c); c = false;',
			attrPresence: 'n = h.attrPresence(n, r, "#{1}", c); c = false;',
			attr: function(m)
			{
				m[3] = (m[5] || m[6]);
				return new Template('n = h.attr(n, r, "#{1}", "#{3}", "#{2}", c); c = false;').evaluate(m);
			},
			pseudo: function(m)
			{
				if(m[6]) m[6] = m[6].replace(/"/g, '\\"');
				return new Template('n = h.pseudo(n, "#{1}", "#{6}", r, c); c = false;').evaluate(m);
			},
			descendant: 'c = "descendant";',
			child: 'c = "child";',
			adjacent: 'c = "adjacent";',
			laterSibling: 'c = "laterSibling";'
		},
		patterns:
		{
			laterSibling: /^\s*~\s*/,
			child: /^\s*>\s*/,
			adjacent: /^\s*\+\s*/,
			descendant: /^\s/,
			tagName: /^\s*(\*|[\w\-]+)(\b|$)?/,
			id: /^#([\w\-\*]+)(\b|$)/,
			className: /^\.([\w\-\*]+)(\b|$)/,
			pseudo: /^:((first|last|nth|nth-last|only)(-child|-of-type)|empty|checked|(en|dis)abled|not)(\((.*?)\))?(\b|$|(?=\s|[:+~>]))/,
			attrPresence: /^\[([\w]+)\]/,
			attr: /\[((?:[\w-]*:)?[\w-]+)\s*(?:([!^$*~|]?=)\s*((['"])([^\4]*?)\4|([^'"][^\]]*?)))?\]/
		},
		assertions:
		{
			tagName: function(element, matches)
			{
				return matches[1].toUpperCase() == element.tagName.toUpperCase();
			},
			className: function(element, matches)
			{
				return Element.hasClassName(element, matches[1]);
			},
			id: function(element, matches)
			{
				return element.id === matches[1];
			},
			attrPresence: function(element, matches)
			{
				return Element.hasAttribute(element, matches[1]);
			},
			attr: function(element, matches)
			{
				var nodeValue = Element.readAttribute(element, matches[1]);
				return nodeValue && Selector.operators[matches[2]](nodeValue, matches[5] || matches[6]);
			}
		},
		handlers:
		{
			concat: function(a, b)
			{
				for(var i = 0, node; node = b[i]; i++)
				a.push(node);
				return a;
			},
			mark: function(nodes)
			{
				var _true = Prototype.emptyFunction;
				for(var i = 0, node; node = nodes[i]; i++)
					node._countedByPrototype = _true;
				return nodes;
			},
			unmark: function(nodes)
			{
				for(var i = 0, node; node = nodes[i]; i++)
					node._countedByPrototype = undefined;
				return nodes;
			},
			index: function(parentNode, reverse, ofType)
			{
				parentNode._countedByPrototype = Prototype.emptyFunction;
				if(reverse)
				{
					for(var nodes = parentNode.childNodes, i = nodes.length - 1, j = 1; i >= 0; i--)
					{
						var node = nodes[i];
						if(node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
					}
				}
				else
				{
					for(var i = 0, j = 1, nodes = parentNode.childNodes; node = nodes[i]; i++)
						if(node.nodeType == 1 && (!ofType || node._countedByPrototype)) node.nodeIndex = j++;
				}
			},
			unique: function(nodes)
			{
				if(nodes.length == 0) return nodes;
				var results = [], n;
				for(var i = 0, l = nodes.length; i < l; i++)
				if(!(n = nodes[i])._countedByPrototype)
				{
					n._countedByPrototype = Prototype.emptyFunction;
					results.push(Element.extend(n));
				}
				return Selector.handlers.unmark(results);
			},
			descendant: function(nodes)
			{
				var h = Selector.handlers;
				for(var i = 0, results = [], node; node = nodes[i]; i++)
					h.concat(results, node.getElementsByTagName('*'));
				return results;
			},
			child: function(nodes)
			{
				var h = Selector.handlers;
				for(var i = 0, results = [], node; node = nodes[i]; i++)
				{
					for(var j = 0, child; child = node.childNodes[j]; j++)
						if(child.nodeType == 1 && child.tagName != '!') results.push(child);
				}
				return results;
			},
			adjacent: function(nodes)
			{
				for (var i = 0, results = [], node; node = nodes[i]; i++)
				{
					var next = this.nextElementSibling(node);
					if(next) results.push(next);
				}
				return results;
			},
			laterSibling: function(nodes)
			{
				var h = Selector.handlers;
				for(var i = 0, results = [], node; node = nodes[i]; i++)
					h.concat(results, Element.nextSiblings(node));
				return results;
			},
			nextElementSibling: function(node)
			{
				while(node = node.nextSibling)
				if(node.nodeType == 1) return node;
				return null;
			},
			previousElementSibling: function(node)
			{
				while(node = node.previousSibling)
				if(node.nodeType == 1) return node;
				return null;
			},
			tagName: function(nodes, root, tagName, combinator)
			{
				var uTagName = tagName.toUpperCase();
				var results = [], h = Selector.handlers;
				if(nodes)
				{
					if(combinator)
					{
						if(combinator == "descendant")
						{
							for(var i = 0, node; node = nodes[i]; i++)
								h.concat(results, node.getElementsByTagName(tagName));
							return results;
						}
						else nodes = this[combinator](nodes);
						if(tagName == "*") return nodes;
					}
					for(var i = 0, node; node = nodes[i]; i++)
						if(node.tagName.toUpperCase() === uTagName) results.push(node);
					return results;
				}
				else return root.getElementsByTagName(tagName);
			},
			id: function(nodes, root, id, combinator)
			{
				var targetNode = $(id), h = Selector.handlers;
				if(!targetNode) return [];
				if(!nodes && root == document) return [targetNode];
				if(nodes)
				{
					if(combinator)
					{
						if(combinator == 'child')
						{
							for(var i = 0, node; node = nodes[i]; i++)
								if(targetNode.parentNode == node) return [targetNode];
						}
						else if(combinator == 'descendant')
						{
							for(var i = 0, node; node = nodes[i]; i++)
								if(Element.descendantOf(targetNode, node)) return [targetNode];
						}
						else if (combinator == 'adjacent')
						{
							for(var i = 0, node; node = nodes[i]; i++)
								if(Selector.handlers.previousElementSibling(targetNode) == node)
							return [targetNode];
						}
						else nodes = h[combinator](nodes);
					}
					for(var i = 0, node; node = nodes[i]; i++)
						if(node == targetNode) return [targetNode];
					return [];
				}
				return (targetNode && Element.descendantOf(targetNode, root)) ? [targetNode] : [];
			},
			className: function(nodes, root, className, combinator)
			{
				if(nodes && combinator) nodes = this[combinator](nodes);
				return Selector.handlers.byClassName(nodes, root, className);
			},
			byClassName: function(nodes, root, className)
			{
				if(!nodes) nodes = Selector.handlers.descendant([root]);
				var needle = ' ' + className + ' ';
				for(var i = 0, results = [], node, nodeClassName; node = nodes[i]; i++)
				{
					nodeClassName = node.className;
					if(nodeClassName.length == 0) continue;
					if(nodeClassName == className || (' ' + nodeClassName + ' ').include(needle))
					results.push(node);
				}
				return results;
			},
			attrPresence: function(nodes, root, attr, combinator)
			{
				if(!nodes) nodes = root.getElementsByTagName("*");
				if(nodes && combinator) nodes = this[combinator](nodes);
				var results = [];
				for(var i = 0, node; node = nodes[i]; i++)
				if(Element.hasAttribute(node, attr)) results.push(node);
				return results;
			},
			attr: function(nodes, root, attr, value, operator, combinator)
			{
				if(!nodes) nodes = root.getElementsByTagName("*");
				if(nodes && combinator) nodes = this[combinator](nodes);
				var handler = Selector.operators[operator], results = [];
				for(var i = 0, node; node = nodes[i]; i++)
				{
					var nodeValue = Element.readAttribute(node, attr);
					if(nodeValue === null) continue;
					if(handler(nodeValue, value)) results.push(node);
				}
				return results;
			},

			pseudo: function(nodes, name, value, root, combinator)
			{
				if(nodes && combinator) nodes = this[combinator](nodes);
				if(!nodes) nodes = root.getElementsByTagName("*");
				return Selector.pseudos[name](nodes, value, root);
			}
		},
		pseudos:
		{
			'first-child': function(nodes, value, root)
			{
				for(var i = 0, results = [], node; node = nodes[i]; i++)
				{
					if(Selector.handlers.previousElementSibling(node)) continue;
					results.push(node);
				}
				return results;
			},
			'last-child': function(nodes, value, root)
			{
				for(var i = 0, results = [], node; node = nodes[i]; i++)
				{
					if(Selector.handlers.nextElementSibling(node)) continue;
					results.push(node);
				}
				return results;
			},
			'only-child': function(nodes, value, root)
			{
				var h = Selector.handlers;
				for(var i = 0, results = [], node; node = nodes[i]; i++)
				if(!h.previousElementSibling(node) && !h.nextElementSibling(node))
				results.push(node);
				return results;
			},
			'nth-child': function(nodes, formula, root)
			{
				return Selector.pseudos.nth(nodes, formula, root);
			},
			'nth-last-child': function(nodes, formula, root)
			{
				return Selector.pseudos.nth(nodes, formula, root, true);
			},
			'nth-of-type': function(nodes, formula, root)
			{
				return Selector.pseudos.nth(nodes, formula, root, false, true);
			},
			'nth-last-of-type': function(nodes, formula, root)
			{
				return Selector.pseudos.nth(nodes, formula, root, true, true);
			},
			'first-of-type': function(nodes, formula, root)
			{
				return Selector.pseudos.nth(nodes, "1", root, false, true);
			},
			'last-of-type': function(nodes, formula, root)
			{
				return Selector.pseudos.nth(nodes, "1", root, true, true);
			},
			'only-of-type': function(nodes, formula, root)
			{
				var p = Selector.pseudos;
				return p['last-of-type'](p['first-of-type'](nodes, formula, root), formula, root);
			},

			getIndices: function(a, b, total)
			{
				if(a == 0) return b > 0 ? [b] : [];
				return $R(1, total).inject([], function(memo, i)
				{
					if (0 == (i - b) % a && (i - b) / a >= 0) memo.push(i);
					return memo;
				}
				);
			},

			nth: function(nodes, formula, root, reverse, ofType)
			{
				if(nodes.length == 0) return [];
				if(formula == 'even') formula = '2n+0';
				if(formula == 'odd')  formula = '2n+1';
				var h = Selector.handlers, results = [], indexed = [], m;
				h.mark(nodes);
				for(var i = 0, node; node = nodes[i]; i++)
				{
					if(!node.parentNode._countedByPrototype)
					{
						h.index(node.parentNode, reverse, ofType);
						indexed.push(node.parentNode);
					}
				}
				if(formula.match(/^\d+$/))
				{
					formula = Number(formula);
					for(var i = 0, node; node = nodes[i]; i++)
					if(node.nodeIndex == formula) results.push(node);
				}
				else if(m = formula.match(/^(-?\d*)?n(([+-])(\d+))?/))
				{
					if(m[1] == "-") m[1] = -1;
					var a = m[1] ? Number(m[1]) : 1;
					var b = m[2] ? Number(m[2]) : 0;
					var indices = Selector.pseudos.getIndices(a, b, nodes.length);
					for(var i = 0, node, l = indices.length; node = nodes[i]; i++)
					{
						for(var j = 0; j < l; j++)
							if(node.nodeIndex == indices[j]) results.push(node);
					}
				}
				h.unmark(nodes);
				h.unmark(indexed);
				return results;
			},
			'empty': function(nodes, value, root)
			{
				for(var i = 0, results = [], node; node = nodes[i]; i++)
				{
					if(node.tagName == '!' || (node.firstChild && !node.innerHTML.match(/^\s*$/))) continue;
					results.push(node);
				}
				return results;
			},
			'not': function(nodes, selector, root)
			{
				var h = Selector.handlers, selectorType, m;
				var exclusions = new Selector(selector).findElements(root);
				h.mark(exclusions);
				for(var i = 0, results = [], node; node = nodes[i]; i++)
					if(!node._countedByPrototype) results.push(node);
					h.unmark(exclusions);
				return results;
			},
			'enabled': function(nodes, value, root)
			{
				for(var i = 0, results = [], node; node = nodes[i]; i++)
					if(!node.disabled) results.push(node);
				return results;
			},
			'disabled': function(nodes, value, root)
			{
				for(var i = 0, results = [], node; node = nodes[i]; i++)
					if(node.disabled) results.push(node);
				return results;
			},
			'checked': function(nodes, value, root)
			{
				for(var i = 0, results = [], node; node = nodes[i]; i++)
					if(node.checked) results.push(node);
				return results;
			}
		},
		operators:
		{
			'=': function(nv, v)
			{
				return nv == v;
			},
			'!=': function(nv, v)
			{
				return nv != v;
			},
			'^=': function(nv, v)
			{
				return nv.startsWith(v);
			},
			'$=': function(nv, v)
			{
				return nv.endsWith(v);
			},
			'*=': function(nv, v)
			{
				return nv.include(v);
			},
			'~=': function(nv, v)
			{
				return (' ' + nv + ' ').include(' ' + v + ' ');
			},
			'|=': function(nv, v)
			{
				return ('-' + nv.toUpperCase() + '-').include('-' + v.toUpperCase() + '-');
			}
		},
		split: function(expression)
		{
			var expressions = [];
			expression.scan(/(([\w#:.~>+()\s-]+|\*|\[.*?\])+)\s*(,|$)/, function(m)
			{
				expressions.push(m[1].strip());
			}
			);
			return expressions;
		},
		matchElements: function(elements, expression)
		{
			var matches = $$(expression), h = Selector.handlers;
			h.mark(matches);
			for(var i = 0, results = [], element; element = elements[i]; i++)
			if(element._countedByPrototype) results.push(element);
			h.unmark(matches);
			return results;
		},
		findElement: function(elements, expression, index)
		{
			if(Object.isNumber(expression))
			{
				index = expression; expression = false;
			}
			return Selector.matchElements(elements, expression || '*')[index || 0];
		},
		findChildElements: function(element, expressions) 
		{
			expressions = Selector.split(expressions.join(','));
			var results = [], h = Selector.handlers;
			for(var i = 0, l = expressions.length, selector; i < l; i++)
			{
				selector = new Selector(expressions[i].strip());
				h.concat(results, selector.findElements(element));
			}
			return (l > 1) ? h.unique(results) : results;
		}
	}
	);
	if(Prototype.Browser.IE)
	{
		Object.extend(Selector.handlers,
		{
			concat: function(a, b)
			{
				for(var i = 0, node; node = b[i]; i++)
					if(node.tagName !== "!") a.push(node);
				return a;
			},
			unmark: function(nodes)
			{
				for(var i = 0, node; node = nodes[i]; i++)
					node.removeAttribute('_countedByPrototype');
				return nodes;
			}
		}
		);
	}
	function $$()
	{
		return Selector.findChildElements(document, $A(arguments));
	}
	var Form =
	{
		reset: function(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;
			var data = elements.inject({ }, function(result, element)
			{
				if(!element.disabled && element.name)
				{
					key = element.name; value = $(element).getValue();
					if(value != null && (element.type != 'submit' || (!submitted && submit !== false && (!submit || key == submit) && (submitted = true))))
					{
						if(key in result)
						{
							if(!Object.isArray(result[key])) result[key] = [result[key]];
							result[key].push(value);
						}
						else result[key] = value;
					}
				}
				return result;
			}
			);
			return options.hash ? data : Object.toQueryString(data);
		}
	};
	Form.Methods =
	{
		serialize: function(form, options)
		{
			return Form.serializeElements(Form.getElements(form), options);
		},
		getElements: function(form)
		{
		return $A($(form).getElementsByTagName('*')).inject([],
		function(elements, child)
		{
			if(Form.Element.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'].include(element.tagName.toLowerCase());
		}
		);
	},
	focusFirstElement: function(form)
	{
		form = $(form);
		form.findFirstElement().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'].include(element.type)))
			element.select();
		}
		catch (e){ }
		return element;
	},
	disable: function(element)
	{
		element = $(element);
		element.blur();
		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 =
{
	input: function(element, value)
	{
		switch (element.type.toLowerCase())
		{
			case 'checkbox':
			case 'radio':
			return Form.Element.Serializers.inputSelector(element, value);
			default:
			return Form.Element.Serializers.textarea(element, value);
		}
	},
	inputSelector: function(element, value)
	{
		if(Object.isUndefined(value)) return element.checked ? element.value : null;
		else element.checked = !!value;
	},
	textarea: function(element, value)
	{
		if(Object.isUndefined(value)) return element.value;
		else element.value = value;
	},
	select: function(element, index)
	{
		if(Object.isUndefined(index))
		return this[element.type == 'select-one' ? 'selectOne' : 'selectMany'](element);
		else
		{
			var opt, value, single = !Object.isArray(index);
			for(var i = 0, length = element.length; i < length; i++)
			{
				opt = element.options[i];
				value = this.optionValue(opt);
				if(single)
				{
					if(value == index)
					{
						opt.selected = true;
						return;
					}
				}
				else opt.selected = index.include(value);
			}
		}
	},
	selectOne: function(element)
	{
		var index = element.selectedIndex;
		return index >= 0 ? this.optionValue(element.options[index]) : null;
	},
	selectMany: function(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(this.optionValue(opt));
		}
		return values;
	},
	optionValue: function(opt)
	{
		return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;
	}
};

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);
	}
}
);
if(!window.Event) var Event = { };
Object.extend(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: { },
	relatedTarget: function(event)
	{
		var element;
		switch(event.type)
		{
			case 'mouseover': element = event.fromElement; break;
			case 'mouseout':  element = event.toElement;   break;
			default: return null;
		}
		return Element.extend(element);
	}
}
);

Event.Methods = (function()
{
	var isButton;
	if(Prototype.Browser.IE)
	{
		var buttonMap = { 0: 1, 1: 4, 2: 2 };
		isButton = function(event, code)
		{
			return event.button == buttonMap[code];
		};
	}
	else if(Prototype.Browser.WebKit)
	{
		isButton = function(event, code)
		{
			switch (code)
			{
				case 0: return event.which == 1 && !event.metaKey;
				case 1: return event.which == 1 && event.metaKey;
				default: return false;
			}
		};
	}
	else
	{
		isButton = function(event, code)
		{
			return event.which ? (event.which === code + 1) : (event.button === code);
		};
	}
	return{
		isLeftClick: function(event){return isButton(event, 0)},
		isMiddleClick: function(event){return isButton(event, 1)},
		isRightClick: function(event){return isButton(event, 2)},
		element: function(event)
		{
			var node = Event.extend(event).target;
			return Element.extend(node.nodeType == Node.TEXT_NODE ? node.parentNode : node);
		},
		findElement: function(event, expression)
		{
			var element = Event.element(event);
			if(!expression) return element;
			var elements = [element].concat(element.ancestors());
			return Selector.findElement(elements, expression, 0);
		},
		pointer: function(event)
		{
			return{
			x: event.pageX || (event.clientX + (document.documentElement.scrollLeft || document.body.scrollLeft)),
			y: event.pageY || (event.clientY + (document.documentElement.scrollTop || document.body.scrollTop))
			};
		},
		pointerX: function(event){return Event.pointer(event).x},
		pointerY: function(event){return Event.pointer(event).y},
		stop: function(event)
		{
			Event.extend(event);
			event.preventDefault();
			event.stopPropagation();
			event.stopped = true;
		}
	};
}
)();

Event.extend = (function()
{
	var methods = Object.keys(Event.Methods).inject({ }, function(m, name)
	{
		m[name] = Event.Methods[name].methodize();
		return m;
	}
	);
	if(Prototype.Browser.IE)
	{
		Object.extend(methods,
		{
			stopPropagation: function() { this.cancelBubble = true },
			preventDefault:  function() { this.returnValue = false },
			inspect: function() { return "[object Event]" }
		}
		);
		return function(event)
		{
			if(!event) return false;
			if(event._extendedByPrototype) return event;
			event._extendedByPrototype = Prototype.emptyFunction;
			var pointer = Event.pointer(event);
			Object.extend(event,
			{
				target: event.srcElement,
				relatedTarget: Event.relatedTarget(event),
				pageX:  pointer.x,
				pageY:  pointer.y
			}
			);
			return Object.extend(event, methods);
		};
	}
	else
	{
		Event.prototype = Event.prototype || document.createEvent("HTMLEvents").__proto__;
		Object.extend(Event.prototype, methods);
		return Prototype.K;
	}
}
)();

Object.extend(Event, (function()
{
	var cache = Event.cache;
	function getEventID(element)
	{
		if(element._prototypeEventID) return element._prototypeEventID[0];
		arguments.callee.id = arguments.callee.id || 1;
		return element._prototypeEventID = [++arguments.callee.id];
	}
	function getDOMEventName(eventName)
	{
		if(eventName && eventName.include(':')) return "dataavailable";
		return eventName;
	}
	function getCacheForID(id)
	{
		return cache[id] = cache[id] || { };
	}
	function getWrappersForEventName(id, eventName)
	{
		var c = getCacheForID(id);
		return c[eventName] = c[eventName] || [];
	}
	function createWrapper(element, eventName, handler)
	{
		var id = getEventID(element);
		var c = getWrappersForEventName(id, eventName);
		if(c.pluck("handler").include(handler)) return false;
		var wrapper = function(event)
		{
			if(!Event || !Event.extend || (event.eventName && event.eventName != eventName))
				return false;
			Event.extend(event);
			handler.call(element, event);
		};
		wrapper.handler = handler;
		c.push(wrapper);
		return wrapper;
	}
	function findWrapper(id, eventName, handler)
	{
		var c = getWrappersForEventName(id, eventName);
		return c.find(function(wrapper) { return wrapper.handler == handler });
	}
	function destroyWrapper(id, eventName, handler)
	{
		var c = getCacheForID(id);
		if(!c[eventName]) return false;
		c[eventName] = c[eventName].without(findWrapper(id, eventName, handler));
	}
	function destroyCache()
	{
		for(var id in cache)
		for(var eventName in cache[id])
			cache[id][eventName] = null;
	}
	if(window.attachEvent)
	{
		window.attachEvent("onunload", destroyCache);
	}
	return{
		observe: function(element, eventName, handler)
		{
			element = $(element);
			var name = getDOMEventName(eventName);
			var wrapper = createWrapper(element, eventName, handler);
			if(!wrapper) return element;
			if(element.addEventListener)
			{
				element.addEventListener(name, wrapper, false);
			}
			else
			{
				element.attachEvent("on" + name, wrapper);
			}
			return element;
		},
		stopObserving: function(element, eventName, handler)
		{
			element = $(element);
			var id = getEventID(element), name = getDOMEventName(eventName);
			if(!handler && eventName)
			{
				getWrappersForEventName(id, eventName).each(function(wrapper)
				{
					element.stopObserving(eventName, wrapper.handler);
				}
				);
				return element;
			}
			else if(!eventName)
			{
				Object.keys(getCacheForID(id)).each(function(eventName)
				{
					element.stopObserving(eventName);
				}
				);
				return element;
			}
			var wrapper = findWrapper(id, eventName, handler);
			if(!wrapper) return element;
			if(element.removeEventListener)
			{
				element.removeEventListener(name, wrapper, false);
			}
			else
			{
				element.detachEvent("on" + name, wrapper);
			}
			destroyWrapper(id, eventName, handler);
			return element;
		},
		fire: function(element, eventName, memo)
		{
			element = $(element);
			if(element == document && document.createEvent && !element.dispatchEvent)
				element = document.documentElement;
			var event;
			if(document.createEvent)
			{
				event = document.createEvent("HTMLEvents");
				event.initEvent("dataavailable", true, true);
			}
			else
			{
				event = document.createEventObject();
				event.eventType = "ondataavailable";
			}
			event.eventName = eventName;
			event.memo = memo || { };
			if(document.createEvent)
			{
				element.dispatchEvent(event);
			}
			else
			{
				element.fireEvent(event.eventType, event);
			}
			return Event.extend(event);
		}
	};
}
)());

Object.extend(Event, Event.Methods);

Element.addMethods(
{
	fire: Event.fire,
	observe: Event.observe,
	stopObserving: Event.stopObserving
}
);

Object.extend(document,
{
	fire: Element.Methods.fire.methodize(),
	observe: Element.Methods.observe.methodize(),
	stopObserving: Element.Methods.stopObserving.methodize(),
	loaded: false
}
);

(function()
{
	var timer;
	function fireContentLoadedEvent()
	{
		if(document.loaded) return;
		if(timer) window.clearInterval(timer);
		document.fire("dom:loaded");
		document.loaded = true;
	}
	if(document.addEventListener)
	{
		if(Prototype.Browser.WebKit)
		{
			timer = window.setInterval(function()
			{
				if(/loaded|complete/.test(document.readyState))
					fireContentLoadedEvent();
			}, 0);
			Event.observe(window, "load", fireContentLoadedEvent);
		}
		else
		{
			document.addEventListener("DOMContentLoaded",
			fireContentLoadedEvent, false);
		}
	}
	else
	{
		document.write("<script id=__onDOMContentLoaded defer src=//:><\/script>");
		$("__onDOMContentLoaded").onreadystatechange = function()
		{
			if(this.readyState == "complete")
			{
				this.onreadystatechange = null;
				fireContentLoadedEvent();
			}
		};
	}
}
)();

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);

Element.addMethods();