// ------------------------------------------------------
// Set the viewport vars:

var viewportwidth;
var viewportheight;

// the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight

if (typeof window.innerWidth != 'undefined')
{
	viewportwidth = window.innerWidth,
	viewportheight = window.innerHeight
} // IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)
else if (typeof document.documentElement != 'undefined'
	&& typeof document.documentElement.clientWidth !=
	'undefined' && document.documentElement.clientWidth != 0)
{
	viewportwidth = document.documentElement.clientWidth,
	viewportheight = document.documentElement.clientHeight
}
else // older versions of IE
{
	viewportwidth = document.getElementsByTagName('body')[0].clientWidth,
	viewportheight = document.getElementsByTagName('body')[0].clientHeight
}