var http = null;
if (window.XMLHttpRequest) {
	http = new XMLHttpRequest();
} else if (window.ActiveXObject) {
	http = new ActiveXObject("Microsoft.XMLHTTP");
}
if (http != null) {
	http.open("GET", "index.php?res="+screen.width+"x"+screen.height, true);
	http.send(null);
}