Many moons ago, I wrote this small library package. It handles a number of interactive functions that one might use on a Web 2.0 site.
It's not fully tested but I use parts and pieces of it quite often.
I figure that if anyone else finds it useful they might like to look at it. Especially those new to programming.
The most interesting is an animation function which allows you to set the velocity of a div tag and then watch it zoom around the screen.
Most functions are multi-browser compatible, I think one if IE only though.
Feel free to use for any of your projects. A link would be nice but not mandatory.