Possible Duplicate:
Passing mouse clicks through an overlaying element <div>
Is it possible to click the link below the red square without javascript? The red div doesn't need to be clickable.

http://jsfiddle.net/efortis/LNwHV/
#bottom{
 width: 100px;
 height: 100px;
 background-color: orange;
}
#top{
  width: 50px;
  height: 50px;
  position: absolute;
  left:0;
  top:0;
  background-color: rgba(255,0,0,.5);
 }
 
     
    