var viewportwidth;
var viewportheight;
var vpWidth;
var vpHeight;
function vpWidth() {
	return window.innerWidth || document.documentElement.clientWidth || screen.availWidth || document.body.clientWidth;}
function vpHeight() {
	return window.innerHeight || document.documentElement.clientHeight || screen.availHeight ||document.body.clientHeight;}

viewportwidth = vpWidth();
viewportheight = vpHeight();