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TopUp is an easy to use Javascript library for unobtrusively displaying images and webpages in a Web 2.0 approach of popups. The library is jQuery and jQuery UI driven in order to maintain cross-browser compatibility and compactness. TopUp offers the following advantages:

* TopUp is absolutely free, also for commercial use (view the license)
* A very easy setup process: only one(!) include and nothing more
* Using TopUp presets keeps your HTML code 100% clean, no extra code needed whatsoever
* The ability of displaying images, flash (from sites like Youtube, SWF and FLV files), movies (QuickTime, Windows Media and Realplayer), iframes, DOM elements and raw HTML
* TopUp can be used along with Prototype (just include TopUp before Prototype)
* TopUp is compressed with Yahoo! YUI Compressor to 47.6 KB (includes JS, HTML and CSS)
* Usage of CSS sprites to reduce the amount of image requests to two per layout for faster loading
* Cross-browser compatibility
* Fancy layouts, animations and transitions
* Auto-correction of size and position when required
* The possibility to create groups
* Support for AJAX requests
* It’s open source: check out and enhance TopUp yourself!
* And many more…