/* *** library functions *** */

function pageWidth() {
	var w = null;
	if (window.innerWidth) {
		w = window.innerWidth;
	}
	else if (document.documentElement && document.documentElement.clientWidth) {
		w = document.documentElement.clientWidth;
	}
	else if (document.body) {
		w = document.body.clientWidth;
	}
	return w;
}

function pageHeight() {
	var h = null;
	if (window.innerHeight) {
		h = window.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight) {
		h = document.documentElement.clientHeight;
	}
	else if (document.body) {
		h = document.body.clientHeight;
	}
	return h;
}

// taken from http://www.openjs.com/scripts/dom/class_manipulation.php

function hasClass(ele,cls) {
	return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}
 
function addClass(ele,cls) {
	if (!this.hasClass(ele,cls)) ele.className += " "+cls;
}
 
function removeClass(ele,cls) {
	if (hasClass(ele,cls)) {
		var reg = new RegExp('(\\s|^)'+cls+'(\\s|$)');
		ele.className=ele.className.replace(reg,' ');
	}
}

// taken from http://www.dustindiaz.com/rock-solid-addevent/
// licensed under CC-GNU LGPL License: http://creativecommons.org/license/cc-lgpl

function addEvent( obj, type, fn ) {
	if (obj.addEventListener) {
		obj.addEventListener( type, fn, false );
		EventCache.add(obj, type, fn);
	}
	else if (obj.attachEvent) {
		obj["e"+type+fn] = fn;
		obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
		obj.attachEvent( "on"+type, obj[type+fn] );
		EventCache.add(obj, type, fn);
	}
	else {
		obj["on"+type] = obj["e"+type+fn];
	}
}

var EventCache = function(){
	var listEvents = [];
	return {
		listEvents : listEvents,
		add : function(node, sEventName, fHandler){
			listEvents.push(arguments);
		},
		flush : function(){
			var i, item;
			for(i = listEvents.length - 1; i >= 0; i = i - 1){
				item = listEvents[i];
				if(item[0].removeEventListener){
					item[0].removeEventListener(item[1], item[2], item[3]);
				};
				if(item[1].substring(0, 2) != "on"){
					item[1] = "on" + item[1];
				};
				if(item[0].detachEvent){
					item[0].detachEvent(item[1], item[2]);
				};
				item[0][item[1]] = null;
			};
		}
	};
}();

addEvent(window,'unload',EventCache.flush);