function createRequestObject() {
	var browser = navigator.appName;
	var requestObject;
	if(browser == "Microsoft Internet Explorer") {
		requestObject = new ActiveXObject("Microsoft.XMLHTTP");
	}
	else {
		requestObject = new XMLHttpRequest();
	}
	return requestObject;
}

var http = createRequestObject();

function sendRequest(url) {
    http.open('get', url + '?' + Math.random());
    http.onreadystatechange = response;
    http.send(null);
}