function getXMLHttp() {
	var xmlHttp
	
	try {
		//Firefox, Opera 8.0+, Safari
		xmlHttp = new XMLHttpRequest();
	}
	catch(e) {
		//Internet Explorer
		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch(e) {
			try {
				xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch(e) {
				alert("Your browser does not support AJAX!")
				return false;
			}
		}
	}
	return xmlHttp;
}
	
function MakeRequest(phpFile,phpVars) {
	var xmlHttp = getXMLHttp();
	
	xmlHttp.onreadystatechange = function() {
		if(xmlHttp.readyState == 4) {
			HandleResponse(xmlHttp.responseText);
		}
	}
	
	xmlHttp.open("GET", phpFile+"?"+phpVars, true);
	xmlHttp.send(null);
}