A jQuery lightBox plugin is simple, elegant, unobtrusive, no need extra markup.
FancyBox is a tool for displaying images, html content and multi-media in a Mac-style “lightbox” that floats overtop of web page.
Lightbox is a simple, unobtrusive script used to overlay images on the current page. It’s a snap to setup and works on all modern browsers.
prettyPhoto is a jQuery based lightbox clone. Not only does it support images, it also add support for videos, flash, YouTube, iFrames. It’s a full blown media lightbox. The setup is easy and quick, plus the script is compatible in every major browser.
Facebox is a jQuery-based, Facebook-style lightbox which can display images, divs, or entire remote pages. It’s simple to use and easy on the eyes. Download the tarball, view the examples, then start enjoying the curves.