/*Common function calling for AJAX request */
function makeRequest(url) {
	http_request = false;
	if (window.XMLHttpRequest) { 
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType("text/xml");					
		}
	}else if (window.ActiveXObject) { 
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) {
		alert("Giving up :( Cannot create an XMLHTTP instance");
		return false;
	}
	http_request.onreadystatechange = alertContents;
	http_request.open("GET", url, true);
	http_request.send(null);
}