#GB_overlay {
  opacity:.8;
  filter:alpha(opacity=80);
  position: absolute;
  margin: auto;
  top: 0;
  left: 0;
  z-index: 9999;
  width:  100%;
  height: 100%;
}
.blanco{
  background:#fff;
}
.negro{
  background:#000;
}
* html #GB_overlay {
  background-color: #000;
  background-color: transparent;
  background-image: url(../images/blank.gif);
  filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src="../images/overlay.png", sizingMethod="scale");
}

#GB_window {
  top: 50%;
  left: 50%;
  position: absolute;
  background: #fff;
  border: 1px solid #000;
  overflow: auto;
  width: 400px;
  height: 400px;
  z-index: 10000;
  margin-top: -250px;
  overflow: hidden;
}

#GB_frame {
  border: 0;
  overflow: auto;
  width: 100%;
  height: 400px;
}

#GB_caption {
  color: #000;
  background: #fff;
  padding: 10px 0 0px 20px;
  margin: 0;
  text-align: left;
  font-size: 20px;
  font-family: Arial;
  font-style: italic;
  font-weight: bold;
  height: 32px;
  display: block;
}

#GB_window img {
  position: absolute;
  top: 7px;
  right: 15px;
  cursor: pointer;
  cursor: hand;
}