function setDivHeight()
	{
		var viewportheight;
		// the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight
		if (typeof window.innerWidth != 'undefined')
		{
			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)
		{
			viewportheight = document.documentElement.clientHeight;
		}
		// older versions of IE
		else
		{
			viewportheight = document.getElementsByTagName('body')[0].clientHeight;
		}
		// get the remaining height available
		viewportheight = viewportheight - 500;

		// no less than 100 pizels
		if (viewportheight < 100)
		{
			viewportheight = 100;
		}

		// we only need 200 more pixels actually
		if (viewportheight > 395)
		{
			viewportheight = 395;
		}

		var theDiv = document.getElementById("vlightbox");
		theDiv.style.height = viewportheight + "px";
	}
	setDivHeight();