Animation getting interrupted, any ideas?

Hi,

I’ve designed a menu where there are four buttons. The fill in the buttons fades up to 45% alpha when the button is rolled-over, and back to 0% when rolled-out.

The problem is that when I roll over the four buttons quickly, the short animations (10 frames) get interrupted and the shapes stay filled and start to work in funny ways. I think this is because the fade in and out animations are getting interrupted and this is somehow messing the whole thing up.

Any ideas about how I can ensure the fading in and out always completes and operates correctly?

Thanks,

Ian