It would take some work to get that done, since vbulletin seems to read with php modifiers (like $buttondir=images/ocean), so it won't just grab a single image, but read the button names from a list, and then let you set the dir name for where they are. In short, doing a mouse-over effect for that might be slightly difficult.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram