// Make request object
var http;
if (navigator.appName == "Microsoft Internet Explorer"){
	http = new ActiveXObject("Microsoft.XMLHTTP");
} else {
	http = new XMLHttpRequest();
}

// Find resolution
var res = screen.width + 'x' + screen.height;

// Submit data
http.open('get', '/rpc/stats_resolution.php?res='+res);
http.send(null);