#full-screen-image {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: -1;
}

* html #full-screen-image {
    position:absolute;
    bottom:auto;
    top:expression(eval(document.documentElement.scrollTop));
}

  #full-screen-image img {
    position: fixed;
    top: 0 !important;
    left: 0 !important;
    z-index: 2;
  }

	#full-screen-image #overlay {
		position:absolute;
		top:0;
		left:0;
		width:100%;
		height:100%;
		background:url('/assets/img/overlay.png') repeat;
		z-index:5;
	}