Jx, a javascript library for creating graphical user interaces based on the fabulous MooTools library. They provide access to the library as well as extensive documentation and examples.
The Jx examples are a set of web pages that illustrate specific Jx components. Simply click on a page in the tree to the left to load the appropriate sample and get started exploring Jx right away.
To Change between Jx skins, simply click the button to expose a list of available skins and select a new skin to see the effect immediately.
Website: http://jxlib.org/