function getViewportDimensions() {
	var viewportwidth;
	var viewportheight;
	if (typeof window.innerWidth != 'undefined') {
		viewportwidth = window.innerWidth,
		viewportheight = window.innerHeight
	} else if (typeof document.documentElement != 'undefined' && typeof document.documentElement.clientWidth != 'undefined' && document.documentElement.clientWidth != 0) {
		viewportwidth = document.documentElement.clientWidth,
		viewportheight = document.documentElement.clientHeight
	} else {
		viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
		viewportheight = document.getElementsByTagName('body')[0].clientHeight
	}
	return {"width":viewportwidth,"height":viewportheight};
}