Ajax Cross Domain

function ajax(callback, url){
    var is_question_mark = url.indexOf("?");
    var remove_cache = "?random=" + Math.random();

    if(is_question_mark > 0) {
        remove_cache = "&random=" + Math.random();
    }
    
    if ($.browser.msie && window.XDomainRequest && $.browser.version < 10) { //code for IE 10-
        var http_request = new XDomainRequest();
    } else if (window.XMLHttpRequest) {//Firefox, Chrome, Opera, Safari
        var http_request = new XMLHttpRequest();
    } else {
        var http_request = new ActiveXObject("Microsoft.XMLHTTP");
    }

    http_request.onload=function()
    {
        callback(JSON.parse(http_request.responseText));
    }

    http_request.open("GET", url + remove_cache, true);
    http_request.send();
};