Binding two buttons together

Hi

I want to bind two buttons together like I have one button may be in one sprite and then I have another button in another sprite so when the user roll over button1 I want the color of button1 to change to rollover color and at the same time I want the color of button2 to to be changed to its rollover color as well.

I hope I making sense here.

If you need more explaining please let me know

Thanks