function sendRequest(url, callback, parameter, postData) {
	var req = createXMLHTTPObject();
	if (!req) return;
	var method = (postData) ? "POST" : "GET";
	req.open(method, url, true);
	//req.overrideMimeType('text/html');
	//req.overrideMimeType('text/json');
	//req.overrideMimeType('text/plain');
	req.setRequestHeader('User-Agent','XMLHTTP/1.0');
	if (postData) {
		req.setRequestHeader('Content-type','application/x-www-form-urlencoded');
	}
	req.onreadystatechange = function () {
		if (req.readyState != 4) return;
		if (req.status != 200 && req.status != 304) {
			// alert('HTTP error ' + req.status);
			return;
		}
		callback(req);
	}
	if (req.readyState == 4) return;
	req.send(parameter);
}

var XMLHttpFactories = [
	function () { return new XMLHttpRequest() },
	function () { return new ActiveXObject("Msxml2.XMLHTTP") },
	function () { return new ActiveXObject("Msxml3.XMLHTTP") },
	function () { return new ActiveXObject("Microsoft.XMLHTTP") } 
];

function createXMLHTTPObject() {
	var xmlhttp = false;
	for (var i=0;i<XMLHttpFactories.length;i++) {
		try { xmlhttp = XMLHttpFactories[i](); }
		catch (e) { continue; }
		break;
	}
	return xmlhttp;
}