function createREQ() {
	try {
		req = new XMLHttpRequest(); //Firefox
	}
	catch(err1) {
		try {
			req = new ActiveXObject("Msxml2.XMLHTTP"); //some IE versions
		}
		catch(err2) {
			try {
				req = new ActiveXObject("Microsoft.XMLHTTP"); //some IE versions
			}
			catch(err3) {
				req = false;
			}
		}
	}
	return req;
}

function requestGET(url, query, req) {
	myRand = parseInt(Math.random()*99999999);
	req.open("GET", url + '?' + query + '&rand=' + myRand, true);
	req.send(null);
}

function requestPOST(url, query, req) {
	req.open("POST", url, true);
	req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
	req.send(query);
}

function doCallback(callback, item) {
	eval(callback + '(item)');
}

function doAjax(url, query, callback, reqtype, getxml) {
	var myreq = createREQ();
	myreq.onreadystatechange = function() {
		if(myreq.readyState == 4) {
			if(myreq.status == 200) {
				var item = myreq.responseText;
				if(getxml == 1) {
					item = myreq.responseXML;
				}
				doCallback(callback, item);
			}
		}
	}
	if(reqtype == 'post') {
		requestPOST(url, query, myreq);
	} else {
		requestGET(url, query, myreq);
	}
}