Animated graphics are very popular on the web.
Before you add an animated graphic to your home page, you need to consider how it will contribute to your site - just like any other graphic. Animated graphics are a little more unique since they need to reload from the server. Also, you might not want to put more than one animated graphic on each page. First, you can add a graphic that is already animated, or create your own. GIF animation on the WWW - Gallery of graphics to look at.