var prototype = {
	version: '1.4.0',
	scriptfragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

	emptyfunction: function() { },
	k: function(x) { return x }
}

var class = {
	create: function() {
		return function() {
			this.initialize.apply(this, arguments);
		}
	}
}

var abstract = new object();

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

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

function.prototype.bind = function() {
	var __method = this, args = $a(arguments), object = args.shift();
	return function() {
		return __method.apply(object, args.concat($a(arguments)));
	}
}

function.prototype.bindaseventlistener = function(object) {
	var __method = this;
	return function(event) {
		return __method.call(object, event || window.event);
	}
}

object.extend(number.prototype, {
	tocolorpart: function() {
		var digits = this.tostring(16);
		if (this < 16) return '0' + digits;
		return digits;
	},

	succ: function() {
		return this + 1;
	},

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

var try = {
	these: function() {
		var returnvalue;

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

		return returnvalue;
	}
}

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

var periodicalexecuter = class.create();
periodicalexecuter.prototype = {
	initialize: function(callback, frequency) {
		this.callback = callback;
		this.frequency = frequency;
		this.currentlyexecuting = false;

		this.registercallback();
	},

	registercallback: function() {
		setinterval(this.ontimerevent.bind(this), this.frequency * 1000);
	},

	ontimerevent: function() {
		if (!this.currentlyexecuting) {
			try {
				this.currentlyexecuting = true;
				this.callback();
			} finally {
				this.currentlyexecuting = false;
			}
		}
	}
}

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

function $() {
	var elements = new array();

	for (var i = 0; i < arguments.length; i++) {
		var element = arguments[i];
		if (typeof element == 'string')
			element = document.getelementbyid(element);

		if (arguments.length == 1)
			return element;

		elements.push(element);
	}

	return elements;
}
object.extend(string.prototype, {
	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(eval);
	},

	escapehtml: function() {
		var div = document.createelement('div');
		var text = document.createtextnode(this);
		div.appendchild(text);
		return div.innerhtml;
	},

	unescapehtml: function() {
		var div = document.createelement('div');
		div.innerhtml = this.striptags();
		return div.childnodes[0] ? div.childnodes[0].nodevalue : '';
	},

	toqueryparams: function() {
		var pairs = this.match(/^\??(.*)$/)[1].split('&');
		return pairs.inject({}, function(params, pairstring) {
			var pair = pairstring.split('=');
			params[pair[0]] = pair[1];
			return params;
		});
	},

	toarray: function() {
		return this.split('');
	},

	camelize: function() {
		var ostringlist = this.split('-');
		if (ostringlist.length == 1) return ostringlist[0];

		var camelizedstring = this.indexof('-') == 0
      ? ostringlist[0].charat(0).touppercase() + ostringlist[0].substring(1)
      : ostringlist[0];

		for (var i = 1, len = ostringlist.length; i < len; i++) {
			var s = ostringlist[i];
			camelizedstring += s.charat(0).touppercase() + s.substring(1);
		}

		return camelizedstring;
	},

	inspect: function() {
		return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
	}
});

string.prototype.parsequery = string.prototype.toqueryparams;

var $break = new object();
var $continue = new object();

var enumerable = {
	each: function(iterator) {
		var index = 0;
		try {
			this._each(function(value) {
				try {
					iterator(value, index++);
				} catch (e) {
					if (e != $continue) throw e;
				}
			});
		} catch (e) {
			if (e != $break) throw e;
		}
	},

	all: function(iterator) {
		var result = true;
		this.each(function(value, index) {
			result = result && !!(iterator || prototype.k)(value, index);
			if (!result) throw $break;
		});
		return result;
	},

	any: function(iterator) {
		var result = true;
		this.each(function(value, index) {
			if (result = !!(iterator || prototype.k)(value, index))
				throw $break;
		});
		return result;
	},

	collect: function(iterator) {
		var results = [];
		this.each(function(value, index) {
			results.push(iterator(value, index));
		});
		return results;
	},

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

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

	grep: function(pattern, iterator) {
		var results = [];
		this.each(function(value, index) {
			var stringvalue = value.tostring();
			if (stringvalue.match(pattern))
				results.push((iterator || prototype.k)(value, index));
		})
		return results;
	},

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

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

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

	max: function(iterator) {
		var result;
		this.each(function(value, index) {
			value = (iterator || prototype.k)(value, index);
			if (value >= (result || value))
				result = value;
		});
		return result;
	},

	min: function(iterator) {
		var result;
		this.each(function(value, index) {
			value = (iterator || prototype.k)(value, index);
			if (value <= (result || value))
				result = value;
		});
		return result;
	},

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

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

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

	sortby: function(iterator) {
		return this.collect(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.collect(prototype.k);
	},

	zip: function() {
		var iterator = prototype.k, args = $a(arguments);
		if (typeof args.last() == 'function')
			iterator = args.pop();

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

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

object.extend(enumerable, {
	map: enumerable.collect,
	find: enumerable.detect,
	select: enumerable.findall,
	member: enumerable.include,
	entries: enumerable.toarray
});
var $a = array.from = function(iterable) {
	if (!iterable) return [];
	if (iterable.toarray) {
		return iterable.toarray();
	} else {
		var results = [];
		for (var i = 0; i < iterable.length; i++)
			results.push(iterable[i]);
		return results;
	}
}

object.extend(array.prototype, enumerable);

array.prototype._reverse = array.prototype.reverse;

object.extend(array.prototype, {
	_each: function(iterator) {
		for (var i = 0; i < this.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 != undefined || value != null;
		});
	},

	flatten: function() {
		return this.inject([], function(array, value) {
			return array.concat(value.constructor == array ?
        value.flatten() : [value]);
		});
	},

	without: function() {
		var values = $a(arguments);
		return this.select(function(value) {
			return !values.include(value);
		});
	},

	indexof: function(object) {
		for (var i = 0; i < this.length; i++)
			if (this[i] == object) return i;
		return -1;
	},

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

	shift: function() {
		var result = this[0];
		for (var i = 0; i < this.length - 1; i++)
			this[i] = this[i + 1];
		this.length--;
		return result;
	},

	inspect: function() {
		return '[' + this.map(object.inspect).join(', ') + ']';
	}
});
var hash = {
	_each: function(iterator) {
		for (key in this) {
			var value = this[key];
			if (typeof value == 'function') continue;

			var pair = [key, value];
			pair.key = key;
			pair.value = value;
			iterator(pair);
		}
	},

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

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

	merge: function(hash) {
		return $h(hash).inject($h(this), function(mergedhash, pair) {
			mergedhash[pair.key] = pair.value;
			return mergedhash;
		});
	},

	toquerystring: function() {
		return this.map(function(pair) {
			return pair.map(encodeuricomponent).join('=');
		}).join('&');
	},

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

function $h(object) {
	var hash = object.extend({}, object || {});
	object.extend(hash, enumerable);
	object.extend(hash, hash);
	return hash;
}
objectrange = class.create();
object.extend(objectrange.prototype, enumerable);
object.extend(objectrange.prototype, {
	initialize: function(start, end, exclusive) {
		this.start = start;
		this.end = end;
		this.exclusive = exclusive;
	},

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

	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 activexobject('msxml2.xmlhttp') },
      function() { return new activexobject('microsoft.xmlhttp') },
      function() { return new xmlhttprequest() }
    ) || false;
	},

	activerequestcount: 0
}

ajax.responders = {
	responders: [],

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

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

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

	dispatch: function(callback, request, transport, json) {
		this.each(function(responder) {
			if (responder[callback] && typeof responder[callback] == 'function') {
				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 = function() { };
ajax.base.prototype = {
	setoptions: function(options) {
		this.options = {
			method: 'post',
			asynchronous: true,
			parameters: ''
		}
		object.extend(this.options, options || {});
	},

	responseissuccess: function() {
		return this.transport.status == undefined
        || this.transport.status == 0
        || (this.transport.status >= 200 && this.transport.status < 300);
	},

	responseisfailure: function() {
		return !this.responseissuccess();
	}
}

ajax.request = class.create();
ajax.request.events =
  ['uninitialized', 'loading', 'loaded', 'interactive', 'complete'];

ajax.request.prototype = object.extend(new ajax.base(), {
	initialize: function(url, options) {
		this.transport = ajax.gettransport();
		this.setoptions(options);
		this.request(url);
	},

	request: function(url) {
		var parameters = this.options.parameters || '';
		if (parameters.length > 0) parameters += '&_=';

		try {
			this.url = url;
			if (this.options.method == 'get' && parameters.length > 0)
				this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

			ajax.responders.dispatch('oncreate', this, this.transport);

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

			if (this.options.asynchronous) {
				this.transport.onreadystatechange = this.onstatechange.bind(this);
				settimeout((function() { this.respondtoreadystate(1) }).bind(this), 10);
			}

			this.setrequestheaders();

			var body = this.options.postbody ? this.options.postbody : parameters;
			this.transport.send(this.options.method == 'post' ? body : null);

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

	setrequestheaders: function() {
		var requestheaders =
      ['x-requested-with', 'xmlhttprequest',
       'x-prototype-version', prototype.version];

		if (this.options.method == 'post') {
			requestheaders.push('content-type',
        'application/x-www-form-urlencoded');

			/* force "connection: close" for mozilla browsers to work around
			* a bug where xmlhttpreqeuest sends an incorrect content-length
			* header. see mozilla bugzilla #246651.
			*/
			if (this.transport.overridemimetype)
				requestheaders.push('connection', 'close');
		}

		if (this.options.requestheaders)
			requestheaders.push.apply(requestheaders, this.options.requestheaders);

		for (var i = 0; i < requestheaders.length; i += 2)
			this.transport.setrequestheader(requestheaders[i], requestheaders[i + 1]);
	},

	onstatechange: function() {
		var readystate = this.transport.readystate;
		if (readystate != 1)
			this.respondtoreadystate(this.transport.readystate);
	},

	header: function(name) {
		try {
			return this.transport.getresponseheader(name);
		} catch (e) { }
	},

	evaljson: function() {
		try {
			return eval(this.header('x-json'));
		} catch (e) { }
	},

	evalresponse: function() {
		try {
			return eval(this.transport.responsetext);
		} catch (e) {
			this.dispatchexception(e);
		}
	},

	respondtoreadystate: function(readystate) {
		var event = ajax.request.events[readystate];
		var transport = this.transport, json = this.evaljson();

		if (event == 'complete') {
			try {
				(this.options['on' + this.transport.status]
         || this.options['on' + (this.responseissuccess() ? 'success' : 'failure')]
         || prototype.emptyfunction)(transport, json);
			} catch (e) {
				this.dispatchexception(e);
			}

			if ((this.header('content-type') || '').match(/^text\/javascript/i))
				this.evalresponse();
		}

		try {
			(this.options['on' + event] || prototype.emptyfunction)(transport, json);
			ajax.responders.dispatch('on' + event, this, transport, json);
		} catch (e) {
			this.dispatchexception(e);
		}

		/* avoid memory leak in msie: clean up the oncomplete event handler */
		if (event == 'complete')
			this.transport.onreadystatechange = prototype.emptyfunction;
	},

	dispatchexception: function(exception) {
		(this.options.onexception || prototype.emptyfunction)(this, exception);
		ajax.responders.dispatch('onexception', this, exception);
	}
});

ajax.updater = class.create();

object.extend(object.extend(ajax.updater.prototype, ajax.request.prototype), {
	initialize: function(container, url, options) {
		this.containers = {
			success: container.success ? $(container.success) : $(container),
			failure: container.failure ? $(container.failure) :
        (container.success ? null : $(container))
		}

		this.transport = ajax.gettransport();
		this.setoptions(options);

		var oncomplete = this.options.oncomplete || prototype.emptyfunction;
		this.options.oncomplete = (function(transport, object) {
			this.updatecontent();
			oncomplete(transport, object);
		}).bind(this);

		this.request(url);
	},

	updatecontent: function() {
		var receiver = this.responseissuccess() ?
      this.containers.success : this.containers.failure;
		var response = this.transport.responsetext;

		if (!this.options.evalscripts)
			response = response.stripscripts();

		if (receiver) {
			if (this.options.insertion) {
				new this.options.insertion(receiver, response);
			} else {
				element.update(receiver, response);
			}
		}

		if (this.responseissuccess()) {
			if (this.oncomplete)
				settimeout(this.oncomplete.bind(this), 10);
		}
	}
});

ajax.periodicalupdater = class.create();
ajax.periodicalupdater.prototype = object.extend(new ajax.base(), {
	initialize: function(container, url, options) {
		this.setoptions(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.oncomplete = undefined;
		cleartimeout(this.timer);
		(this.oncomplete || prototype.emptyfunction).apply(this, arguments);
	},

	updatecomplete: function(request) {
		if (this.options.decay) {
			this.decay = (request.responsetext == this.lasttext ?
        this.decay * this.options.decay : 1);

			this.lasttext = request.responsetext;
		}
		this.timer = settimeout(this.ontimerevent.bind(this),
      this.decay * this.frequency * 1000);
	},

	ontimerevent: function() {
		this.updater = new ajax.updater(this.container, this.url, this.options);
	}
});
document.getelementsbyclassname = function(classname, parentelement) {
	var children = ($(parentelement) || document.body).getelementsbytagname('*');
	return $a(children).inject([], function(elements, child) {
		if (child.classname.match(new regexp("(^|\\s)" + classname + "(\\s|$)")))
			elements.push(child);
		return elements;
	});
}

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

if (!window.element) {
	var element = new object();
}

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

	toggle: function() {
		for (var i = 0; i < arguments.length; i++) {
			var element = $(arguments[i]);
			element[element.visible(element) ? 'hide' : 'show'](element);
		}
	},

	hide: function() {
		for (var i = 0; i < arguments.length; i++) {
			var element = $(arguments[i]);
			element.style.display = 'none';
		}
	},

	show: function() {
		for (var i = 0; i < arguments.length; i++) {
			var element = $(arguments[i]);
			element.style.display = '';
		}
	},

	remove: function(element) {
		element = $(element);
		element.parentnode.removechild(element);
	},

	update: function(element, html) {
		$(element).innerhtml = html.stripscripts();
		settimeout(function() { html.evalscripts() }, 10);
	},

	getheight: function(element) {
		element = $(element);
		return element.offsetheight;
	},

	classnames: function(element) {
		return new element.classnames(element);
	},

	hasclassname: function(element, classname) {
		if (!(element = $(element))) return;
		return element.classnames(element).include(classname);
	},

	addclassname: function(element, classname) {
		if (!(element = $(element))) return;
		return element.classnames(element).add(classname);
	},

	removeclassname: function(element, classname) {
		if (!(element = $(element))) return;
		return element.classnames(element).remove(classname);
	},

	// removes whitespace-only text node children
	cleanwhitespace: function(element) {
		element = $(element);
		for (var i = 0; i < element.childnodes.length; i++) {
			var node = element.childnodes[i];
			if (node.nodetype == 3 && !/\s/.test(node.nodevalue))
				element.remove(node);
		}
	},

	empty: function(element) {
		return $(element).innerhtml.match(/^\s*$/);
	},

	scrollto: function(element) {
		element = $(element);
		var x = element.x ? element.x : element.offsetleft,
        y = element.y ? element.y : element.offsettop;
		window.scrollto(x, y);
	},

	getstyle: function(element, style) {
		element = $(element);
		var value = element.style[style.camelize()];
		if (!value) {
			if (document.defaultview && document.defaultview.getcomputedstyle) {
				var css = document.defaultview.getcomputedstyle(element, null);
				value = css ? css.getpropertyvalue(style) : null;
			} else if (element.currentstyle) {
				value = element.currentstyle[style.camelize()];
			}
		}

		if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
			if (element.getstyle(element, 'position') == 'static') value = 'auto';

		return value == 'auto' ? null : value;
	},

	setstyle: function(element, style) {
		element = $(element);
		for (name in style)
			element.style[name.camelize()] = style[name];
	},

	getdimensions: function(element) {
		element = $(element);
		if (element.getstyle(element, 'display') != 'none')
			return { width: element.offsetwidth, height: element.offsetheight };

		// all *width and *height properties give 0 on elements with display none,
		// so enable the element temporarily
		var els = element.style;
		var originalvisibility = els.visibility;
		var originalposition = els.position;
		els.visibility = 'hidden';
		els.position = 'absolute';
		els.display = '';
		var originalwidth = element.clientwidth;
		var originalheight = element.clientheight;
		els.display = 'none';
		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';
			// opera returns the offset relative to the positioning context, when an
			// element is position relative but top and left have not been defined
			if (window.opera) {
				element.style.top = 0;
				element.style.left = 0;
			}
		}
	},

	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 = '';
		}
	},

	makeclipping: function(element) {
		element = $(element);
		if (element._overflow) return;
		element._overflow = element.style.overflow;
		if ((element.getstyle(element, 'overflow') || 'visible') != 'hidden')
			element.style.overflow = 'hidden';
	},

	undoclipping: function(element) {
		element = $(element);
		if (element._overflow) return;
		element.style.overflow = element._overflow;
		element._overflow = undefined;
	}
});

var toggle = new object();
toggle.display = element.toggle;

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

abstract.insertion = function(adjacency) {
	this.adjacency = adjacency;
}

abstract.insertion.prototype = {
	initialize: function(element, content) {
		this.element = $(element);
		this.content = content.stripscripts();

		if (this.adjacency && this.element.insertadjacenthtml) {
			try {
				this.element.insertadjacenthtml(this.adjacency, this.content);
			} catch (e) {
				if (this.element.tagname.tolowercase() == 'tbody') {
					this.insertcontent(this.contentfromanonymoustable());
				} else {
					throw e;
				}
			}
		} else {
			this.range = this.element.ownerdocument.createrange();
			if (this.initializerange) this.initializerange();
			this.insertcontent([this.range.createcontextualfragment(this.content)]);
		}

		settimeout(function() { content.evalscripts() }, 10);
	},

	contentfromanonymoustable: function() {
		var div = document.createelement('div');
		div.innerhtml = '<table><tbody>' + this.content + '</tbody></table>';
		return $a(div.childnodes[0].childnodes[0].childnodes);
	}
}

var insertion = new object();

insertion.before = class.create();
insertion.before.prototype = object.extend(new abstract.insertion('beforebegin'), {
	initializerange: function() {
		this.range.setstartbefore(this.element);
	},

	insertcontent: function(fragments) {
		fragments.each((function(fragment) {
			this.element.parentnode.insertbefore(fragment, this.element);
		}).bind(this));
	}
});

insertion.top = class.create();
insertion.top.prototype = object.extend(new abstract.insertion('afterbegin'), {
	initializerange: function() {
		this.range.selectnodecontents(this.element);
		this.range.collapse(true);
	},

	insertcontent: function(fragments) {
		fragments.reverse(false).each((function(fragment) {
			this.element.insertbefore(fragment, this.element.firstchild);
		}).bind(this));
	}
});

insertion.bottom = class.create();
insertion.bottom.prototype = object.extend(new abstract.insertion('beforeend'), {
	initializerange: function() {
		this.range.selectnodecontents(this.element);
		this.range.collapse(this.element);
	},

	insertcontent: function(fragments) {
		fragments.each((function(fragment) {
			this.element.appendchild(fragment);
		}).bind(this));
	}
});

insertion.after = class.create();
insertion.after.prototype = object.extend(new abstract.insertion('afterend'), {
	initializerange: function() {
		this.range.setstartafter(this.element);
	},

	insertcontent: function(fragments) {
		fragments.each((function(fragment) {
			this.element.parentnode.insertbefore(fragment,
        this.element.nextsibling);
		}).bind(this));
	}
});

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

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(this.toarray().concat(classnametoadd).join(' '));
	},

	remove: function(classnametoremove) {
		if (!this.include(classnametoremove)) return;
		this.set(this.select(function(classname) {
			return classname != classnametoremove;
		}).join(' '));
	},

	tostring: function() {
		return this.toarray().join(' ');
	}
}

object.extend(element.classnames.prototype, enumerable);
var field = {
	clear: function() {
		for (var i = 0; i < arguments.length; i++)
			$(arguments[i]).value = '';
	},

	focus: function(element) {
		$(element).focus();
	},

	present: function() {
		for (var i = 0; i < arguments.length; i++)
			if ($(arguments[i]).value == '') return false;
		return true;
	},

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

	activate: function(element) {
		element = $(element);
		element.focus();
		if (element.select)
			element.select();
	}
}

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

var form = {
	serialize: function(form) {
		var elements = form.getelements($(form));
		var querycomponents = new array();

		for (var i = 0; i < elements.length; i++) {
			var querycomponent = form.element.serialize(elements[i]);
			if (querycomponent)
				querycomponents.push(querycomponent);
		}

		return querycomponents.join('&');
	},

	getelements: function(form) {
		form = $(form);
		var elements = new array();

		for (tagname in form.element.serializers) {
			var tagelements = form.getelementsbytagname(tagname);
			for (var j = 0; j < tagelements.length; j++)
				elements.push(tagelements[j]);
		}
		return elements;
	},

	getinputs: function(form, typename, name) {
		form = $(form);
		var inputs = form.getelementsbytagname('input');

		if (!typename && !name)
			return inputs;

		var matchinginputs = new array();
		for (var i = 0; i < inputs.length; i++) {
			var input = inputs[i];
			if ((typename && input.type != typename) ||
          (name && input.name != name))
				continue;
			matchinginputs.push(input);
		}

		return matchinginputs;
	},

	disable: function(form) {
		var elements = form.getelements(form);
		for (var i = 0; i < elements.length; i++) {
			var element = elements[i];
			element.blur();
			element.disabled = 'true';
		}
	},

	enable: function(form) {
		var elements = form.getelements(form);
		for (var i = 0; i < elements.length; i++) {
			var element = elements[i];
			element.disabled = '';
		}
	},

	findfirstelement: function(form) {
		return form.getelements(form).find(function(element) {
			return element.type != 'hidden' && !element.disabled &&
        ['input', 'select', 'textarea'].include(element.tagname.tolowercase());
		});
	},

	focusfirstelement: function(form) {
		field.activate(form.findfirstelement(form));
	},

	reset: function(form) {
		$(form).reset();
	}
}

form.element = {
	serialize: function(element) {
		element = $(element);
		var method = element.tagname.tolowercase();
		var parameter = form.element.serializers[method](element);

		if (parameter) {
			var key = encodeuricomponent(parameter[0]);
			if (key.length == 0) return;

			if (parameter[1].constructor != array)
				parameter[1] = [parameter[1]];

			return parameter[1].map(function(value) {
				return key + '=' + encodeuricomponent(value);
			}).join('&');
		}
	},

	getvalue: function(element) {
		element = $(element);
		var method = element.tagname.tolowercase();
		var parameter = form.element.serializers[method](element);

		if (parameter)
			return parameter[1];
	}
}

form.element.serializers = {
	input: function(element) {
		switch (element.type.tolowercase()) {
			case 'submit':
			case 'hidden':
			case 'password':
			case 'text':
				return form.element.serializers.textarea(element);
			case 'checkbox':
			case 'radio':
				return form.element.serializers.inputselector(element);
		}
		return false;
	},

	inputselector: function(element) {
		if (element.checked)
			return [element.name, element.value];
	},

	textarea: function(element) {
		return [element.name, element.value];
	},

	select: function(element) {
		return form.element.serializers[element.type == 'select-one' ?
      'selectone' : 'selectmany'](element);
	},

	selectone: function(element) {
		var value = '', opt, index = element.selectedindex;
		if (index >= 0) {
			opt = element.options[index];
			value = opt.value;
			if (!value && !('value' in opt))
				value = opt.text;
		}
		return [element.name, value];
	},

	selectmany: function(element) {
		var value = new array();
		for (var i = 0; i < element.length; i++) {
			var opt = element.options[i];
			if (opt.selected) {
				var optvalue = opt.value;
				if (!optvalue && !('value' in opt))
					optvalue = opt.text;
				value.push(optvalue);
			}
		}
		return [element.name, value];
	}
}

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

var $f = form.element.getvalue;

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

abstract.timedobserver = function() { }
abstract.timedobserver.prototype = {
	initialize: function(element, frequency, callback) {
		this.frequency = frequency;
		this.element = $(element);
		this.callback = callback;

		this.lastvalue = this.getvalue();
		this.registercallback();
	},

	registercallback: function() {
		setinterval(this.ontimerevent.bind(this), this.frequency * 1000);
	},

	ontimerevent: function() {
		var value = this.getvalue();
		if (this.lastvalue != value) {
			this.callback(this.element, value);
			this.lastvalue = value;
		}
	}
}

form.element.observer = class.create();
form.element.observer.prototype = object.extend(new abstract.timedobserver(), {
	getvalue: function() {
		return form.element.getvalue(this.element);
	}
});

form.observer = class.create();
form.observer.prototype = object.extend(new abstract.timedobserver(), {
	getvalue: function() {
		return form.serialize(this.element);
	}
});

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

abstract.eventobserver = function() { }
abstract.eventobserver.prototype = {
	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() {
		var elements = form.getelements(this.element);
		for (var i = 0; i < elements.length; i++)
			this.registercallback(elements[i]);
	},

	registercallback: function(element) {
		if (element.type) {
			switch (element.type.tolowercase()) {
				case 'checkbox':
				case 'radio':
					event.observe(element, 'click', this.onelementevent.bind(this));
					break;
				case 'password':
				case 'text':
				case 'textarea':
				case 'select-one':
				case 'select-multiple':
					event.observe(element, 'change', this.onelementevent.bind(this));
					break;
			}
		}
	}
}

form.element.eventobserver = class.create();
form.element.eventobserver.prototype = object.extend(new abstract.eventobserver(), {
	getvalue: function() {
		return form.element.getvalue(this.element);
	}
});

form.eventobserver = class.create();
form.eventobserver.prototype = object.extend(new abstract.eventobserver(), {
	getvalue: function() {
		return form.serialize(this.element);
	}
});
if (!window.event) {
	var event = new object();
}

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,

	element: function(event) {
		return event.target || event.srcelement;
	},

	isleftclick: function(event) {
		return (((event.which) && (event.which == 1)) ||
            ((event.button) && (event.button == 1)));
	},

	pointerx: function(event) {
		return event.pagex || (event.clientx +
      (document.documentelement.scrollleft || document.body.scrollleft));
	},

	pointery: function(event) {
		return event.pagey || (event.clienty +
      (document.documentelement.scrolltop || document.body.scrolltop));
	},

	stop: function(event) {
		if (event.preventdefault) {
			event.preventdefault();
			event.stoppropagation();
		} else {
			event.returnvalue = false;
			event.cancelbubble = true;
		}
	},

	// find the first node with the given tagname, starting from the
	// node the event was triggered on; traverses the dom upwards
	findelement: function(event, tagname) {
		var element = event.element(event);
		while (element.parentnode && (!element.tagname ||
        (element.tagname.touppercase() != tagname.touppercase())))
			element = element.parentnode;
		return element;
	},

	observers: false,

	_observeandcache: function(element, name, observer, usecapture) {
		if (!this.observers) this.observers = [];
		if (element.addeventlistener) {
			this.observers.push([element, name, observer, usecapture]);
			element.addeventlistener(name, observer, usecapture);
		} else if (element.attachevent) {
			this.observers.push([element, name, observer, usecapture]);
			element.attachevent('on' + name, observer);
		}
	},

	unloadcache: function() {
		if (!event.observers) return;
		for (var i = 0; i < event.observers.length; i++) {
			event.stopobserving.apply(this, event.observers[i]);
			event.observers[i][0] = null;
		}
		event.observers = false;
	},

	observe: function(element, name, observer, usecapture) {
		var element = $(element);
		usecapture = usecapture || false;

		if (name == 'keypress' &&
        (navigator.appversion.match(/konqueror|safari|khtml/)
        || element.attachevent))
			name = 'keydown';

		this._observeandcache(element, name, observer, usecapture);
	},

	stopobserving: function(element, name, observer, usecapture) {
		var element = $(element);
		usecapture = usecapture || false;

		if (name == 'keypress' &&
        (navigator.appversion.match(/konqueror|safari|khtml/)
        || element.detachevent))
			name = 'keydown';

		if (element.removeeventlistener) {
			element.removeeventlistener(name, observer, usecapture);
		} else if (element.detachevent) {
			element.detachevent('on' + name, observer);
		}
	}
});

/* prevent memory leaks in ie */
event.observe(window, 'unload', event.unloadcache, false);
var position = {
	// set to true if needed, warning: firefox performance problems
	// not neeeded for page scrolling, only if draggable contained in
	// scrollable elements
	includescrolloffsets: false,

	// must be called before calling withinincludingscrolloffset, every time the
	// page is scrolled
	prepare: function() {
		this.deltax = window.pagexoffset
                || document.documentelement.scrollleft
                || document.body.scrollleft
                || 0;
		this.deltay = window.pageyoffset
                || document.documentelement.scrolltop
                || document.body.scrolltop
                || 0;
	},

	realoffset: function(element) {
		var valuet = 0, valuel = 0;
		do {
			valuet += element.scrolltop || 0;
			valuel += element.scrollleft || 0;
			element = element.parentnode;
		} while (element);
		return [valuel, valuet];
	},

	cumulativeoffset: function(element) {
		var valuet = 0, valuel = 0;
		do {
			valuet += element.offsettop || 0;
			valuel += element.offsetleft || 0;
			element = element.offsetparent;
		} while (element);
		return [valuel, valuet];
	},

	positionedoffset: function(element) {
		var valuet = 0, valuel = 0;
		do {
			valuet += element.offsettop || 0;
			valuel += element.offsetleft || 0;
			element = element.offsetparent;
			if (element) {
				p = element.getstyle(element, 'position');
				if (p == 'relative' || p == 'absolute') break;
			}
		} while (element);
		return [valuel, valuet];
	},

	offsetparent: 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;
	},

	// caches x/y coordinate pair to use with overlap
	within: function(element, x, y) {
		if (this.includescrolloffsets)
			return this.withinincludingscrolloffsets(element, x, y);
		this.xcomp = x;
		this.ycomp = y;
		this.offset = this.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 = this.realoffset(element);

		this.xcomp = x + offsetcache[0] - this.deltax;
		this.ycomp = y + offsetcache[1] - this.deltay;
		this.offset = this.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);
	},

	// within must be called directly before
	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;
	},

	clone: function(source, target) {
		source = $(source);
		target = $(target);
		target.style.position = 'absolute';
		var offsets = this.cumulativeoffset(source);
		target.style.top = offsets[1] + 'px';
		target.style.left = offsets[0] + 'px';
		target.style.width = source.offsetwidth + 'px';
		target.style.height = source.offsetheight + 'px';
	},

	page: function(forelement) {
		var valuet = 0, valuel = 0;

		var element = forelement;
		do {
			valuet += element.offsettop || 0;
			valuel += element.offsetleft || 0;

			// safari fix
			if (element.offsetparent == document.body)
				if (element.getstyle(element, 'position') == 'absolute') break;

		} while (element = element.offsetparent);

		element = forelement;
		do {
			valuet -= element.scrolltop || 0;
			valuel -= element.scrollleft || 0;
		} while (element = element.parentnode);

		return [valuel, valuet];
	},

	clone: function(source, target) {
		var options = object.extend({
			setleft: true,
			settop: true,
			setwidth: true,
			setheight: true,
			offsettop: 0,
			offsetleft: 0
		}, arguments[2] || {})

		// find page position of source
		source = $(source);
		var p = position.page(source);

		// find coordinate system to use
		target = $(target);
		var delta = [0, 0];
		var parent = null;
		// delta [0,0] will do fine with position: fixed elements,
		// position:absolute needs offsetparent deltas
		if (element.getstyle(target, 'position') == 'absolute') {
			parent = position.offsetparent(target);
			delta = position.page(parent);
		}

		// correct by body offsets (fixes safari)
		if (parent == document.body) {
			delta[0] -= document.body.offsetleft;
			delta[1] -= document.body.offsettop;
		}

		// set position
		if (options.setleft) target.style.left = (p[0] - delta[0] + options.offsetleft) + 'px';
		if (options.settop) target.style.top = (p[1] - delta[1] + options.offsettop) + 'px';
		if (options.setwidth) target.style.width = source.offsetwidth + 'px';
		if (options.setheight) target.style.height = source.offsetheight + 'px';
	},

	absolutize: function(element) {
		element = $(element);
		if (element.style.position == 'absolute') return;
		position.prepare();

		var offsets = position.positionedoffset(element);
		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'; ;
	},

	relativize: function(element) {
		element = $(element);
		if (element.style.position == 'relative') return;
		position.prepare();

		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;
	}
}

// safari returns margins on body which is incorrect if the child is absolutely
// positioned.  for performance reasons, redefine position.cumulativeoffset for
// khtml/webkit only.
if (/konqueror|safari|khtml/.test(navigator.useragent)) {
	position.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 [valuel, valuet];
	}
}