function getWindowWidth() {
	if (window.innerWidth) //if browser supports window.innerWidth
		return window.innerWidth;
	else if (document.all) //else if browser supports document.all (IE 4+)
		return document.body.clientWidth;
}

function getWindowHeight() {
	if (window.innerHeight) //if browser supports window.innerWidth
		return window.innerHeight;
	else if (document.all) //else if browser supports document.all (IE 4+)
		return document.body.clientHeight;
}