#divLoading {
    display: none;
}
    #divLoading.show {
        display: block;
        position: fixed;
        z-index: 1000000;
        background-image: url('loader.gif');
        background-color: #a9a9a9;
        opacity: 0.4;
        background-repeat: no-repeat;
        background-position: center;
        left: 0;
        bottom: 0;
        right: 0;
        top: 0;
    }