var pos="";
var xmlHttp;
function makePOSTRequest(url, parameters,id) {
	http_request = false;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
		// set type accordingly to anticipated content type
		//http_request.overrideMimeType('text/xml');
		http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
			try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
			try {
			http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	pos=id;
	http_request.onreadystatechange = alertContents;
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parameters.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parameters);
}

function alertContents() {

	var image= '<div style="text-align:center; padding-top:20%">' + '<img src="themes/tuvan/images/loading.gif" /> <br/>Đang xử lý ...</div>';
	var image2= '<div style="text-align:center; padding-top:20%">' + '<img src="themes/tuvan/images/loading.gif" /> <br/>Đã tải dữ liệu ...</div>';	
	document.getElementById(pos).innerHTML=image;

	if (http_request.readyState == 4) {
		document.getElementById(pos).innerHTML=image2;
		if (http_request.status == 200) {
			result = http_request.responseText;
			document.getElementById(pos).innerHTML = result;
		} else {
			alert('Lỗi đường truyền');
		}
	}

}