Telling a movie clip to play if lable

programming flash
1

Hi,
I have a movie called book_mc that is on scene1 the movie has several labels (red, green, blue, and yellow) in it’s timeline. Also, on scene1 I have a button called book_but. If book_mc is on the label green of it’s timeline. I want the button press of book_but to make it goto and play yellow. If book_mc is not on the green label of it’ timeline I want the button press of book_but to make the timeline goto and play red.

Thanks for help,
KateH:}