if (document.images) {
    var ajaxloader = new Image(25, 25);
    ajaxloader.src = "/Images/ajax-loader.gif";
}

$(document).ready(function () {
});

function GetAJAXLoader(appendText) {
    return "<img src=\"" + ajaxloader.src + "\" alt=\"loading\" />" + (appendText != undefined ? "<span>" + appendText + "</span>" : "");
}