YUI is the Yahoo! User Interface Library, "a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX. The YUI Library also includes several core CSS resources. All components in the YUI Library have been released as open source under a BSD license and are free for all uses."
See http://developer.yahoo.com/yui for more details including documentation, demos, code examples, blogs, and forums.
WebGUI comes with the YUI libraries in the www/extras/yui directory. To include these in your web site, use script tags such as the following:
Use the "-min" versions of the files for a lighter version of the file with comments and whitespace stripped out.
Keywords: yui