fancyBox is a tool that offers a nice and elegant way to add zooming
functionality for images, html content and multi-media on your webpages. It is
built on the top of the popular JavaScript framework jQuery and is both easy to
implement and a snap to customize.

Features:
- Can display images, HTML elements, SWF movies, iframes and also Ajax
  requests.
- Customizable through settings and CSS.
- Groups related items and adds navigation.
- If the mouse wheel plugin is included in the page then FancyBox will
  respond to mouse wheel events as well.
- Support fancy transitions by using easing plugin.
- Adds a nice drop shadow under the zoomed item.

WWW: http://fancyapps.com/fancybox/