There are many popups and galleries scripts we can use, Multibox is one of them as well. Multibox is lightbox that supports images, flash, video, mp3s, html. You can set the color of the background or use a semi-transparent background. It supports Firefox 2 (mac / pc), IE 7, IE 6, Safari (mac). However, it requires Mootools v1.1+ to run properly.
Requirements: Mootools 1.1+
License: MIT License