Mootools - a compact, modular, Object-Oriented JavaScript framework

From JJ. 

MooTools is a compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer. It allows you to write powerful, flexible, and cross-browser code with its elegant, well documented, and coherent API.

• Home page: http://mootools.net/


• Demos: http://demos.mootools.net/


• Ajax example downloads: http://speckyboy.com/2008/04/09/41-of-the-best-mootools-ajax-example-downloads/