.ajax-mask {
    /*background: none;*/
    background:rgb(0, 0, 0); /* the fall back */
    background:rgba(0, 0, 0,0.4);
    z-index: 1051;
    /*opacity: 0.4;*/
}

.loading {
    width: 50px;
    height: 50px;
    background: #333 url('/img/loading_mask.gif') center center no-repeat;
    /*background-color: black;*/
    border-radius: 3px;
    -moz-border-radius: 3px;
    -webkit-border-radius: 3px;
    position: fixed;
    left:50%;
    margin-left:-25px;
    top:50%;
    margin-top: -25px;
    opacity: 0.9;
    -moz-opacity: 0.9;
    z-index: 1051;
}