div.superModalOverlay {
  background-color:#fff; border:#e0e0e0 5px solid;
  position:fixed; overflow:hidden; z-index:1000; top:50%; left:50%;
}
* html div.superModalOverlay { /* ie6 hack */ position:absolute; }

div.superModalGround {
  background-color:#aaa;
  position: fixed; overflow:hidden; z-index:999; top:0px;  left:0px; height:100%; width:100%;
  filter:alpha(opacity=70); -moz-opacity:0.70; opacity:0.70;
}
* html div.superModalGround { /* ie6 hack */ position:absolute; }