this is an interesting question so let check it if you have a image for use as a website-icon then
Add this to your script
<link rel="icon" type="image/gif" href="animated_favicon1.gif" />
otherwise if you have a icon for your website icon then you chose
<link rel="shortcut icon" href="favicon.ico" />
I always use http://www.iconspedia.com/ for more icons
if my answer solved your problem then give me vote ok