.mask {
    position: absolute;
    top: 0px;
    filter: alpha(opacity=60);
    background-color: #777;
    z-index: 1001;
    left: 0px;
    opacity: 0.5;
    -moz-opacity: 0.5;
    display: none;
}

.maskimg {
    z-index: 1005;
    left: 45%;
    top: 40%;
    position: absolute;
}