this.getDataFromServer = function (path, atStart, atEnd, whenOk, whenFailed) {
        if (atStart) atStart();

        var request = new XMLHttpRequest();
        request.open("GET", path, true);
        request.send();

        request.onreadystatechange = function () {
            _AJAXRequestStates(request, whenOk, whenFailed, atEnd);
        }
    };