#GB_overlay {
 background-image: url(overlay.png); 
 position: absolute;
 margin: auto;
 top: 0;
 left: 0;
 z-index: 100;
 width:  100%;
 height: 100%;
}

* html #GB_overlay {
 background-color: #000;
 background-color: transparent;
 background-image: url(blank.gif);
 filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="overlay.png", sizingMethod="scale");
}

#GB_window {
 top: 0px;
 left: 0px;
 position: absolute;
 background: #666;
 border: 5px solid #aaa;
 overflow: auto;
 width: 400px;
 height: 400px;
 z-index: 150;
}

#GB_frame {
 border: 0;
 overflow: auto;
 width: 100%;
 height: 378px;
}

#GB_caption {
 font: 12px bold helvetica, verdana, sans-serif;
 color: #fff;
 background: #888;
 padding: 2px 0 2px 5px;
 margin: 0;
 text-align: left;
}

#GB_window img {
 position: absolute;
 top: 2px;
 right: 5px;
 cursor: pointer;
 cursor: hand;
}