TopUp Lightbox – Unobtrusive & highly customizable jQuery/jQuery UI driven pop-ups with fancy layouts, animations and transitions.
With TopUp you can display images (image galleries), flash content from sites like Youtube, SWF files and FLV video, QuickTime movies, Windows Media and Realplayer, iframes, DOM elements and raw HTML.

With a current release 1.7.2 it is possible to specify which jQuery libraries to auto-include or not to auto-include at all, enable fast mode and override the assets (host, images_path and players_path) variables.
A few features:
- TopUp is absolutely free, also for commercial use
- A very easy setup process: only one include
- Using TopUp presets keeps your HTML code 100% clean
- TopUp can be used along with Prototype
- Usage of CSS sprites to reduce the amount of image requests
- Cross-browser compatibility
- It’s open source
- and many more…