function precheck(){
	if ((document.body && typeof(document.body.innerHTML)) != 'undefined'){
		request();
	} else {
		alert('Your browser does not support several features of this system.\nPlease upgrade to a newer version');
	}
}
function request(){
	var w = 640, h = 480;
	if (document.all || document.layers) {
	   w = screen.availWidth;
	   h = screen.availHeight;
	}
	var leftPos = (w-520)/2, topPos = (h-360)/2;
	xwindow=window.open("http://www.dullesglassandmirror.com/support/userprechat.htm","DullesGlassandMirrorSupport","toolbar=0,location=0,status=0,menubar=0,scrollbars=1,resizable=1,width=520,height=360,top=" + topPos + ",left=" + leftPos);
	xwindow.focus();
}


document.write("<a href='javascript:;' target=_self onclick='javascript:precheck()'><\/a>");