function doAJAX(url) {
	//document.write(url);
	var http_request = false;
	
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if ( http_request.overrideMimeType ) {
			//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('Your browser does not supper XMLHTTP requests, please upgrade.');
		return false;
	}
	
	//http_request.onreadystatechange = function() { fetchData(http_request); };
	http_request.open('POST', url, false);
	http_request.send(null);
	
	return http_request.responseText;

}

/* 0 (uninitialized), 1 (loading), 2 (loaded), 3 (interactive), 4 (complete) */
function fetchData(http_request) {
	
	if (http_request.readyState == 1) { 
		// loading...
	}
	
	if ( http_request.readyState == 4 ) { // response was received
		if ( http_request.status == 200 ) { // 200 = OK
			responseString = http_request.responseText;
		} else {
			// error
		}
	}

}