.modal_mask {
  position: fixed;
  top: 0px;
  right:0px;
  left: 0px;
  width: 100%;
  height: 100%;
  opacity: .2;
  background-color: #CCCCCC;
  color: #FFFFFF;
}

.modal_mask_ie {
  position: absolute;
  top: expression(eval(document.documentElement.scrollTop));
  left: expression(eval(document.documentElement.scrollLeft));
  width: 100%;
  height: 100%;
  filter: alpha(opacity=20);  
  background-color: #CCCCCC;
  color: #FFFFFF;
}
