function GetScreenWidth()
{
	if (!document.compatMode || document.compatMode == "CSS1Compat") {
		return document.documentElement.clientWidth;
	} else if (document.compatMode) {
		return document.body.clientWidth;
	}
	return document.innerWidth;
}

function GetScreenHeight()
{
	if (!window.opera && (!document.compatMode || document.compatMode == "CSS1Compat")) 
	{
		return document.documentElement.clientHeight;
	} else if (document.compatMode && !window.opera) {
		return document.body.clientHeight;
	}
	return document.innerHeight;
}