var box = false;
var http_request = false;
var poststr = "";

function fromServer () {
 	if (http_request.readyState == 4 && box != false) {
		if (http_request.status == 200) {
			e = document.getElementById (box);
			e.innerHTML = http_request.responseText;
		}
		else {
			alert ('Error: ' + http_request.responseText);
		}
	}
}

function makeRequest (method, url, parameters) {
	http_request = false;
	// Mozilla, Safari,...
	if (window.XMLHttpRequest) { 
		http_request = new XMLHttpRequest ();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/html');
		}
	}
	// IE
	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 ('Error: Cannot create XMLHTTP instance');
		return false;
	}
	http_request.onreadystatechange = fromServer;
	if (method == 'get') {
		http_request.open ('GET', url, true);
		http_request.send (null);
	}
	else if (method == 'post') {
		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);
	}
}