Colorbox is a lightweight customizable lightbox plugin for jQuery.
- Supports photos, grouping, slideshow, ajax, inline, and iframed content
- Lightweight: 10KB of JavaScript
- Appearance is controlled through CSS so it can be restyled
- Can be extended with callbacks & event-hooks without altering the source files
- Completely unobtrusive, options are set in the JS and require no changes to existing HTML
- Preloads upcoming images in a photo group
- Currently used on more than 1.9 million websites