#ads_popup{
    padding:0;
    margin:0;
    left:10px;
    top:100px;
    position:fixed;
    _position: absolute;
    _margin-top: expression(100 + 0 - parseInt(this.offsetHeight / 2) + (TBWindowMargin = document.documentElement && document.documentElement.scrollTop || document.body.scrollTop) + 'px');
    z-index: 9;
}

#ads_overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #666666  50% 50% repeat;
    opacity: .50;
    filter:Alpha(Opacity=50);
}