var Browser = {
	a : navigator.userAgent.toLowerCase()
}
Browser = {
	ie : /*@cc_on true || @*/ false,
	ie6 : Browser.a.indexOf('msie 6') != -1,
	ie7 : Browser.a.indexOf('msie 7') != -1,
	opera : !!window.opera,
	safari : Browser.a.indexOf('safari') != -1,
	safari3 : Browser.a.indexOf('applewebkit/5') != -1,
	mac : Browser.a.indexOf('mac') != -1
}
function $(e) {
	if(typeof e == 'string')
    	return document.getElementById(e);
	return e;
}
String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g, '');
}
// Do not prototype Object or Array if using for-in loops
function indexOf(array, elt /*, from*/) {
	// SpiderMonkey imlementation
	var len = array.length;

	var from = Number(arguments[2]) || 0;
	from = (from < 0) ? Math.ceil(from) : Math.floor(from);
	if(from < 0)
		from += len;

	for(; from < len; from++)
		if(from in array && array[from] === elt)
			return from;

	return -1;
}
function createElement(name, attrs, doc, xmlns) {
	var doc = doc || document;
	var elm;
	if(doc.createElementNS)
		elm = doc.createElementNS(xmlns || "http://www.w3.org/1999/xhtml", name);
	else
		elm = doc.createElement(name);
	if(attrs)
		for(attr in attrs)
			elm.setAttribute(attr, attrs[attr]);
	return elm;
}
function createElementStr(name, attrs) {
	return new NodeStr(name, attrs);
}
function setDisplay(e, display) {
	$(e).style.display = display;
}
function hide(e) {
	setDisplay(e, 'none');
}
function show(e) {
	setDisplay(e, '');
}
function visible(e) {
	return $(e).style.display != 'none';
}
function toggle(e) {
	(visible(e) ? hide : show)(e);
}
function visibleInverse(e) {
	return $(e).style.display != '';
}
function toggleInverse(e, display) {
	setDisplay(e, visibleInverse(e) ? '' : display);
}
function getChildElementsByTagName(e, tagName) {
	var nodes = [];
	for(var i = 0; i < e.childNodes.length; i++)
		if(e.childNodes[i].nodeName.toLowerCase() == tagName)
			nodes.push(e.childNodes[i]);
	return nodes;
}
function getElementsByClassName(className, element, tagName) {
	var regexp = new RegExp('(^|\\s)' + className + '(\\s|$)');
	var tagName = tagName || '*';
	var element = element || document;
	var elements = (tagName == '*' && element.all) ? element.all : element.getElementsByTagName(tagName);
	var found = [];
	for(var i = 0, elm; elm = elements[i]; i++)
		if(regexp.test(elm.className))
			found.push(elm);
	return found;
}
function hasClassName(e, className) {
	return (new RegExp('(^|\\s)' + className + '(\\s|$)').test($(e).className));
}
function addClassName(e, className) {
	var e = $(e);
	if(!hasClassName(e, className))
		e.className += (e.className ? ' ' : '') + className;
}
function removeClassName(e, className) {
	var e = $(e);
	e.className = e.className.replace(new RegExp('(^|\\s+)' + className + '(\\s+|$)'), ' ').trim();
}
function removeChildren(e) {
	while(e.firstChild)
		e.removeChild(e.firstChild);
}
function bind(method, scope, args) {
	if(!args)
		args = [];
	return function() {
		return method.apply(scope, args);
	}
}
function addEvent(obj, evType, fn) {
	if(obj.addEventListener) {
		obj.addEventListener(evType, fn, false);
		return true;
	} else if(obj.attachEvent || Browser.ie)
		return obj.attachEvent('on' + evType, fn);
	return false;
}
function removeEvent(obj, evType, fn) {
	if(obj.removeEventListener) {
		obj.removeEventListener(evType, fn, false);
		return true;
	} else if(obj.detatchEvent || Browser.ie)
		return obj.detachEvent('on' + evType, fn);
	return false;
}
function setBgPos(e, y, x) {
	$(e).style.backgroundPosition = y ? (x ? x + ' ' + y : '0 ' + y) : '0 0';
}
function hasScrolledToBottom(target) {
	return target.scrollTop >= (target.scrollHeight - target.offsetHeight);
}
function addStylesheet(href) {
	document.getElementsByTagName("head")[0].appendChild(createElement('link', {
		'rel': 'stylesheet',
		'type': 'text/css',
		'media': 'screen, projection',
		'href': href
	}));
}