function imageFadeOut(img) 
{
  if ( document.all) 
  {
    img.opacity = 100;
    setOpacity(img.name, -10, 100);
  }
}

function imageFadeIn(img) 
{
  if ( document.all) 
  {
    img.opacity = 0;
    setOpacity(img.name, 10, 100);
  }
}

function setOpacity (imgName, step, delay) 
{
  var img = document.images[imgName];
  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.name + '",' + step + ', ' + delay + ')', delay);
}