Web Design Software Pick of the Week: Yahoo! YUI Library
Sometimes the easiest way to learn a web design technique is to borrow from someone else. Now, a lot of designers will get angry if you borrow their code, but Yahoo! has put together an entire library of scripts and CSS that you can use to create interactive websites. There are two versions of the YUI framework. Version 2 has been available since 2006 and is very robust and proven.
If you’re working on sites that need interactivity, but also need to be very reliable, then this is the version you should use. Version 3 is what they call their “next generation” library. It hasn’t been as widely tested, and includes things that might be more cutting edge. But if you’re building sites that need more advanced (often beta) interactivity options, this is the version for you.
Source:developer.yahoo.com