var ajaxFileName = "ajax.php";
var Request = new Object();

Request.send = function(url, method, callback, data) {
	var sid = Math.random();
	url = url+"&sid="+sid;
	var req;
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
	} else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
	}
	 else
	 {
			return;
	}
	req.onreadystatechange = function() {
		if (req.readyState == 4) {// only if req shows "loaded"
			if (req.status < 400) {// only if "OK"
				(method=="POST") ? callback(req) : callback(req,data);
			}
		}
	}
	if (method=="POST") {
		req.open("POST", url, true);
		req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		req.send(data);
	} else {
		req.open("GET", url, true);
		req.send(null);
	}
	return req;
}