attachment thumbnail hover css

[ZiG]

would anyone know how to replicate the effect on mmochampion:

http://www.mmo-champion.com/index.php

for attachment thumbnails?
all i found was this and i couldnt get it to work with attachment thumbs

http://www.dynamicdrive.com/style/csslibrary/item/css-popup-image-viewer/

any help?