function createReq() {
	if (window.XMLHttpRequest)
		return new XMLHttpRequest();
	if (window.ActiveXObject)
		return new ActiveXObject('Microsoft.XMLHTTP');
}
function urlstring(url, c) {
	var req = createReq();
	req.open("GET", url, true);
	req.onreadystatechange = function() {
		if (req.readyState == 4) {
			c(req.responseText);
		}
	}
	req.send(null);
}