jQuery customizable lightbox

 A lightweight customizable lightbox plugin for jQuery. It supports photos,
 photo groups, slideshow, Ajax, inline, and Iframed content.
 .
 Features:
  * Lightweight: 10KB of JavaScript (less than 5KBs gzipped).
  * 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.
  * Well vetted. ColorBox is one of the top jQuery plugins.