onRollover onRollout, cursor staying on button

I have an image that will double as a button to make it larger if you click it.
on the rollovers I have a plus and minus sign depending on which size the image is currently.

if you click the image and it gets larger the cursor will probably still be on the image. Therefore the minus_mc won’t play until you move your cursor off then back on the image. How can I have the rollover refresh without having the cursor move off of the image?