function Ajax() {
	var xmlHttp = null;

	try {
		// Firefox, Opera 8.0+, Safari

		xmlHttp = new XMLHttpRequest();
	} catch (e) {
		// Internet Explorer

		try {
			xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}

	if(xmlHttp == null) window.alert("Your broswer doesn't support XMLHttpRequests!");

	return xmlHttp;
}