I have an idea of something I would like to implement here that I suspect can be done with CSS rollovers, but I don't know how to script it. So I'm going to describe it and see if someone out there knows how to do this.

I want to be able to use anchors on certain words or passages on text such that when the mouse is over the text in question, CSS reveals a piece of text which is essentially a footnote positioned on the screen where the cursor is. How do I do this? Also these pseudolinks should be color-defined but should be a different color than regular links. My initial thought is that they would not be clickable.

(Looking around for examples, I've seen various fancy menus using CSS rollovers, but I didn't find anything that worked like this.)

A more advanced version of this might involve such rollovers on clickable links that give a little more info, i.e. a very brief passage or some such, from the place linked to.