#please_wait {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    text-align: center;
    background-color: #000;
    filter: alpha(opacity=50);
    -moz-opacity: 0.5;
    opacity: 0.5;
    z-index: 999999
}

    #please_wait div {
        padding: 5px;
        position: relative;
        top: 50%;
    }

        #please_wait div span {
            margin: 10px 0px 0px 0px;
            color: #ffffff;
            white-space: nowrap;
            display: block;
            z-index: 999999
        }