Preload Images Script!!

I am using the below preload images script and It seems to not be working... PHP Code:

<script>
function doPreload()
{

   var the_images = new Array('/images/pd2.gif','/images/explore2.gif',
   '/images/games2.gif','/images/shops2.gif','/images/chat2.gif',
   '/images/mail2.gif','/images/help2.gif','/images/login2.gif',
   '/images/logout2.gif');
   preloadImages(the_images);
}

function preloadImages(the_images_array) {

   for(var loop = 0; loop < the_images_array.length; loop++)
    
   {
    var an_image = new Image();
    an_image.src = the_images_array[loop];
   }
}
</script>