function GetWidth()
{
    if(window.innerWidth)
	return window.innerWidth;
    else if(document.documentElement && document.documentElement.clientWidth)
	return document.documentElement.clientWidth;
    else if(document.body && document.body.clientWidth)
	return document.body.clientWidth;
    else return null;
}

function GetHeight()
{
    if(window.innerHeight)
	return window.innerHeight;
    else if(document.documentElement && document.documentElement.clientHeight)
	return document.documentElement.clientHeight;
    else if(document.body && document.body.clientHeight)
	return document.body.clientHeight;
    else return null;
}