function getHTTPObject(){
	if (window.ActiveXObject) return new ActiveXObject("Microsoft.XMLHTTP");
	else if (window.XMLHttpRequest) return new XMLHttpRequest();
	else {
		alert("Your browser does not support AJAX.");
		return null;
	}
}

function getRes(){
	httpObject = getHTTPObject();
	if (httpObject != null) {
		httpObject.open("GET", "index.php?res="+screen.width+"x"+screen.height, true);
		httpObject.send(null);
//		httpObject.onreadystatechange = setOutput;
	}
}

var httpObject = null;