Préchargement d'image JS

<script type="text/javascript">
<!--
if (document.images)
{
  preload_image = new Image(25,25); 
  preload_image.src="<a href="http://mydomain.com/image.gif" target="_blank">http://mydomain.com/image.gif</a>"; 
}
//-->
</script>

<script type="text/javascript">
<!--
if (document.images)
{
  preload_image_object = new Image();
  // set image url
  image_url = new Array();
  image_url[0] = "<a href="http://mydomain.com/image0.gif" target="_blank">http://mydomain.com/image0.gif</a>";
  image_url[1] = "<a href="http://mydomain.com/image1.gif" target="_blank">http://mydomain.com/image1.gif</a>";
  image_url[2] = "<a href="http://mydomain.com/image2.gif" target="_blank">http://mydomain.com/image2.gif</a>";
  image_url[3] = "<a href="http://mydomain.com/image3.gif" target="_blank">http://mydomain.com/image3.gif</a>";
 
  var i = 0;
  for(i=0; i<=3; i++) 
     preload_image_object.src = image_url[i];
}
//-->
</script>