// JavaScript Document
function makeRequest(url, parameters, callback,spanId,admin) {
	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;
	}
	//alert (callback);
	if (admin==1) document.getElementById(spanId).innerHTML='<img src="../images/ajaxloading.gif">';
	else document.getElementById(spanId).innerHTML='<img src="images/ajaxloading.gif">';
	http_request.onreadystatechange = callback;
	http_request.open('GET', url + parameters, true);
	http_request.send(null);
}