iframe#freeze {
  position: absolute;
  visibility: hidden;
  width: 100%;
  height: 100%;
  filter: alpha(opacity : 0.7);
  KHTMLOpacity: 0.7;
  MozOpacity: 0.7;
  -khtml-opacity: .70;
  -ms-filter: ”alpha(opacity = 70) ”;
  -moz-opacity: .70;
  filter: alpha(opacity = 70);
  opacity: .70;
}