#GB_overlay {
  background-image: url(../beeld/GB_overlay.png); 
  position: absolute;
  margin: auto;
  top: 0;
  left: 0;
  z-index: 1001;
  width:  100%;
  height: 100%;
}

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

#GB_window {
  top: 10px;
  left: 0px;
  position: absolute;
  background: #fff;
  border: 0px solid #aaa;
  overflow: auto;
  width: 400px;
  height: 400px;
  z-index: 1500;
}

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

#GB_caption {
  font: 12px bold "Lucida Grande", arial, verdana, sans-serif;
  color: #fff;
  background: #888;
  padding: 2px 0 2px 5px;
  margin: 0;
  text-align: left;
  display: none;
}

a#GB_sluit {
  position: absolute;
  z-index: 10000;
  top: 0;
  left: 0;
  cursor: pointer;
  cursor: hand;
  text-indent: -9000px;
  display: block;
  width: 30px;
  height: 30px;
  background: url(../beeld/GB_close.png) 0 0 no-repeat;
}

a#GB_sluit:hover {
   background-position: 0 -30px;
}