Cool web tricks

Ever see one of those pages with the cool popup box when you mouse-over a link? Not just the little trick that Internet Explorer does if you include the "title" attribute to an "a" anchor tag, but a real popup box with a caption and colors, etc. I tried searching Google for it, but never got the right combination of keywords to find such a creature.

Well, I finally tracked it down and it's a free JavaScript anyone can use: overLIB