#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: 50px;
  left: 0px;
  position: absolute;
  background: #fff;
  border: 8px solid #999;
  overflow: auto;
  width: 400px;
  height: 400px;
  z-index: 150;
}

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

#GB_caption {
  font: 12px "Segoe UI", Trebuchet MS, Verdana, Arial, sans-serif;
  color: #999;
  background: #fff;
  padding: 5px 0 5px 5px;
  margin: 2px;
  text-align: left;
}

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