this is one of the sleekest way of doing some cool tricks on websites.
If you are a serious web developer and you have not learned how to use jQuery you need to do it right now. The best place to learn is NetTuts:
Just do a simple search for jQuery on there. They have an awesome set of video tutorials for jQuery beginners. Take a look!
Before i Started my blog on wordpress development i had a little blog(60k page view per month) on JQuery development so whenever you hava a problem with JQuery post it up on the forum and i'll try to help you.same goes for every one.