You might want to try this link to DynamicDrive.com. Click on "Image Slideshows" or "Image Galleries and Viewers" for a variety of effects using Javascript. If you choose one, try to make sure it's compatible with all/most browsers. Something more elaborate than what's available there, would require something like flash.

I see your using the Website Wizard for creating your site. While Javascript is usable in the Wizard's main content areas, it does present it's own set of problems. Sometimes it takes reworking the Javascript a little bit to work properly in the Wizard.