Handling movieclips

Hi,
I’ve been trying to figure out this problem for a day and I can’t get it to work!
I have 3 animations (movieclips in a loop:yellow,green & red presents) and 3 buttons.(yellow,green,red)
When you hit eg the red button the red animation should start. When I then hit the green button the red animation should play out until the end of the loop or until last frame and the green animation should start. And so on.
To make things clear I uploaded a test version here:
[COLOR=#800080]http://www.gotoandflash.com/drafts/test.html[/COLOR]
At the moment I disabled the buttons when the animation is visible playing which of course doesn’t work very user friendly :stuck_out_tongue:
Can someone point me in the right direction or show me where I can find a tutorial?
I would be very thankful!
Marieke