function imageFadeOut(img) {
  if (document.all) {
    img.opacity = 100;
    setOpacity(img.id, -5, 50);
  }
}

function imageFadeIn(img) {
  if ( document.all) {
    img.opacity = 0;
    setOpacity(img.id, 5, 50);
  }
}

function setOpacity (imgID, step, delay) {
  var img = document.images[imgID];
  if (img) {
	  img.opacity += step;
	  if (document.all) img.style.filter = 'alpha(opacity = ' + img.opacity + ')'; 
	  if (step > 0 && img.opacity < 100 || step < 0 && img.opacity > 0)
		  setTimeout('setOpacity("' + img.id + '",' + step + ', ' + delay + ')', delay);
  }
}