/* Standart functions for use XML HTTP REQUEST */

var req;

function loadDoc(url) {
	// for XMLHttpRequest version
	if (window.XMLHttpRequest) {
		req = new XMLHttpRequest();
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send(null);
    }
	// for ActiveX version
	else if (window.ActiveXObject) {
		req = new ActiveXObject("Microsoft.XMLHTTP");
		if (req) {
			req.onreadystatechange = processReqChange;
			req.open("GET", url, true);
			req.send();
		}
	}
}

function processReqChange() {
	// if status "complete"
	if (req.readyState == 4) {
		// only if "OK"
		if (req.status == 200) {
			// transfer response text to exterior function "postProcess"
			postProcess(req.responseText);
		}
		// else Error Messages
		else {
			alert("Can not retrieval information:\n" + req.statusText);
		}
	}
}