My personal site has some cool Javascripting using the Moo.fx Javascript library.
http://www.twoplustwoequalsfive.com/
Mouse over the icons, and click and double click the 'twoplustwo'. If you want to do simple animation type things, check out moo.fx. If you want to do complicated animation things, check out Scriptaculous. They are both Javascript libraries that will save you lots of work (but probably still leave you pulling your hair out to get them functioning).