Help with AS 3.0

i am a new user and a fairly new user to Flash CS4, so my question would probably seem simple and stupid, but oh well, here i go:
I have a movie clip on my main timeline and i have a button inside that i want on Mouse click to go back out into the main timeline and play a frame label. Would you tell me what AS to write in the button function to make it work?

Thank you in advance