function createRequestObject() {
	var request_;
	var browser = navigator.appName;
	/*
	#	If the browser is MSIE, use active x to create
	#	the XMLHttpRequest object
	#
	#	Else use the standard method
	*/
	if(browser == "Microsoft Internet Explorer") {
		request_ = new ActiveXObject("Microsoft.XMLHTTP");
	} else {
		request_ = new XMLHttpRequest();
	}
	return request_;
}
var http = createRequestObject();

function ajax ( url, callback ) {
	http.open ( 'get', url, true );
	http.onreadystatechange = callback;
	http.send(null);
}