// FIND PAGE HEIGHT

function BrowserHeight() {
	var b=document.body, e=document.documentElement;
	var esw=0, eow=0, bsw=0, bow=0, esh=0, eoh=0, bsh=0, boh=0;
	if (e)
		pageHeight = e.scrollHeight
	if (b)
		pageHeight = b.scrollHeight

	return pageHeight;
}

var pageHeight = BrowserHeight();
document.getElementById("lightbox").style.height = pageHeight+"px";