While the Dynamic Drive script does work, the code does look a bit
messy and could probably be done in a more standards compliant way
(some of it is not needed as there is code for old browsers).
DOM ToolTip looks like a good alternative, and is very flexible (you
can even do context menus with it).
http://www.mojavelinux.com/projects/domtooltip/I'm sure one could be done from scratch based on jQuery, but I don't
know if it would be worth the effort. But if anyone is up for the
challenge...