XML Request

   function get(url, callback) {
        var request = new XMLHttpRequest();
        request.open('GET', url, true);
        request.onreadystatechange = function() {
            if(this.readyState == 4) {
                if(this.status == 200) {
                    callback(this.responseText);
                }
            }
        }
        request.send(null);
    }