var Common = new Class({

	initialize:function()
	{
	},
	
	getWindowHeight : function()
	{
		if (parseInt(navigator.appVersion)>3) 
		{
			if (navigator.appName=="Netscape") 
			{
				winH = window.innerHeight;
			}
			if (navigator.appName.indexOf("Microsoft")!=-1) {
				winH = document.documentElement.clientHeight;
			}
		}
		return winH;	
	},
	
	getWindowWidth : function()
	{
		if (parseInt(navigator.appVersion)>3) 
		{
			if (navigator.appName=="Netscape") 
			{
				winW = window.innerWidth;
			}
			if (navigator.appName.indexOf("Microsoft")!=-1) {
				winW = document.documentElement.clientWidth;
			}
		}
		return winW;	
	},
	
	getWindowOffsetY : function()
	{
		if (typeof window.pageYOffset != 'undefined')
			return window.pageYOffset;
		else 
			return document.documentElement.scrollTop
	}
});