#GB_overlay {
  background-image: url(../images/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="../images/overlay.png", sizingMethod="scale");
}

#GB_window {
  top: 10px;
  left: 0px;
  position: absolute;
  background: #fff;
  border: 5px solid #bfc32a;
  overflow: hidden;
  z-index: 450;
}

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