>Make two different images rather than trying to just twiddle the color scheme.

Esteban;

Without question Ed's suggestion is the best. You could spend a lot of time getting what you have suggested to work. All you have to do is move to a another computer which has different video cards/drivers and your disabled picture will be different. You will have no control over this but you can find a good image for your disabled state that will not have this problem.

Tom