function httpGetAsync(theUrl, callback, caller) {
    var xhr = new XMLHttpRequest();

    xhr.onreadystatechange = function() {
        if (xhr.readyState === 4 && xhr.status === 200) {
            callback.apply(caller, [JSON.parse(xhr.responseText)]);
        } else {
            console.log("Status de la r�ponse:" + this.status, this.statusText);
        }
    }
    xhr.open("GET", theUrl, true);
    xhr.send(null);
};