#loading {
    position: fixed;
    _position: absolute;
    top: 0px;
    left: 0px;
    width: 100%;
    height: 100%;
    overflow: hidden;
    /*background: url(/images/loading.gif) no-repeat;*/
    z-index: 99999;
    margin: 0px;
    background-color: #444;
    filter: alpha(opacity=30);
    -moz-opacity: 0.3;
    -khtml-opacity: 0.3;
    opacity: 0.3;
    align-content: center;
    text-align: center;
    vertical-align: middle;
}

    #loading img {
        margin: auto;
        left:50%;
        float: left;
        position: absolute;
        top: 40%;
    }