.png { 
  background: transparent url(transparent.png); 
  _background: none; 
  _filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='transparent.png', sizingMethod='image'); 
} 

body { 
  background: #fff url(false) fixed; /* MUST be fixed to avoid scroll judder */ 
} 

.fixed { 
  position: fixed; 
  top: 0; /* or any value ! */ 
  _position: absolute; 
  _top: expression(eval(document.documentElement.scrollTop)+"px");  
} 
