http://developer.yahoo.com/ypatterns/
These three sites are excellent resources for new JavaScript and Ajax developers. The Yahoo! User Interface Library is a set of utilities and controls, written in JavaScript, for building richly interactive Web applications using techniques such as DOM scripting and Ajax. All of the examples are open source and can be used freely in your pages. The JavaScript Developer Center provides documentation for using Yahoo!’s services and APIs, and many code samples you can use to learn about JavaScript and Ajax. The Design Pattern Library (Figure D.5) provides many usable examples of JavaScript interface solutions that can be downloaded and dropped into your sites.
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