Dancing Div Images

[murv]

Right to it:

http://mearvk.org

On IE7 occassionally the menu div items dance around from their centered (desired) position. Doesn't happen on FF 2.0.0.6 or AOL's browser. (Keep hitting f5 until you see it...)

CSS is http://mearvk.org/css/main.css

I bow to your superior CSS knowledge :-)