CSS for "hover" plain link (no image) -->thumbnail

[rock painter]

http://jaspert.free.fr/cobblestones_Paris/thumbnails/jaws_contemporary_art_painting.gif
Hello,

Everywhere you find css and java for images changing into other images when hover..(onMouseOver and so) and other sparkling stuff.

Can someone help me to change a plain link (word) that is no image to a thumbnail (image) when hover ?
Example on Wordpress (snapshot)

It's for my tag cloud here http://jaspert.free.fr

[Medyman]

You can use any CSS technique that you've previously seen. The only difference would be that you don't supply a background for the active state and for the hover state, apply a text indent.

You would need an overflow:hidden property on the anchor as well.