When you turn the head the eyeballs turn with the head but they do not rotate? Is that it? If so, have you parented the eye controllers to the head? That could be the issue.
Post a screen shot of the before and after of what you're trying to do so I can get a better idea of what you mean.
Dave Baer
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida
dbaer@dmac.edu