How this Works:

1. Paste Java Script in the Body
   
   
2. Insert the image in the page
   
   <span id="anim" style="position:relative;"><img src="tbttrfly.gif"></span>
   
   
3. At the bottom of your HTML page, after </html> tag add this Java Script:

   <script language="JavaScript1.2">
   mover('anim');
   </script>