Another Rich DHTML libraries Script.Aculo.US
http://script.aculo.us/
http://wiki.script.aculo.us/scriptaculous/
http://wiki.script.aculo.us/scriptaculous/show/Demos/
Check it out.
well, after finishing chapter 7 of pro JavaScript techniques ..
Now i check to this script aculo. when you see the demo then you will agree with the books, it's the king of DHTML.
Now apperantly when you want to work with cross browser issue. you'll find it's a hard way to event get the properties, on ie it's like this
on others w3c compliance like that. and so on.
so think of using like this one, jquery or moo.fx.