footnote-like pop-up messages

[Piano]

I want to put a feature on my website like this: the reader clicks on a specified word, and a footnote appears, then disappears again when the mouse is moved. Basically, I want to learn to do this:

http://wings.buffalo.edu/litgloss/hugo/text.shtml

(click on "blanchit" to see what I mean)

I know that links can have titles on mouseover, but I don't want it to link anywhere and that website managed to do it without a link. I also thought those sidenotes looked similar to small pop-up windows, so I guessed it was javascript. But I don't know. Help?

Thank you, in advance.

Piano

[HTML]

You are looking for "tooltips" DynamicDrive has a nice assortment www.dynamicdrive.com

Dave

[Piano]

Thank you!