Has anyone had trouble with caching images in javascript?  For example:
<script>
   foo = new Image();
   foo.src = foo.gif;

   function replaceOtherImageWithFoo(){
      document.thatImage.src = foo.src;
   }
</script>
blah blah href="#" onmouseOver(replaceOtherImageWithFoo()) blah blah 
name="thatImage" blah blah blah

The problem is that foo is constantly being called again from the server on 
mouse over, and doesn't cache on the client.  Any ideas?

TIA,
-t3kn0

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