"Mouseover text -> display thumbnail" effect

Hi all!

Allright, first of all here's a link to the only site I've seen doing this trick I need:

http://www.the-underdogs.org/theme.php?id=4 (slow loader and the effect only works in IE - not firefox)

When you hover your mouse over a link to an old game in there - a thumbnail pups-up displaying whatever about that game. Thats exactly what I need!

I'm creating a site for a small soccer club, and would like a picture of every player displayed before reading further informations about them.

Hope someone can help me!

Thanks!