.AJAX_contents {
  position:absolute; 
  top:40%;
  left:43%;
  padding:0px;
  width:16px;
  z-index:9999;
  background-color:#fff;
  text-align:center;
  
}
.AJAX_background {
  position:absolute;
  top:0px;
  bottom:0px;
  left:0px;
  right:0px;
  overflow:hidden;
  padding:0;
  margin:0;
  background-color:#E1E1e1; 
  filter:alpha(opacity=50);
  opacity:0.5;
  height:350px;
  z-index:9908;
}