function creatXMLHttpRequest() {
	try {
		xmlHttp = new XMLHttpRequest();
	} catch (trymicrosoft) {
		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (othermicrosoft) {
			try {
				xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (failed) {
				xmlHttp = false;
			}
		}
	}
	if (!xmlHttp){
		alert("Error initializing XMLHttpRequest!");
	}
}