Stop animated movie clip on button press

Hi

I have two arrows that control an animated movie clip that has words scrolling vertically. When you click on one arrow it plays the movieclip forward, and when you click on the other arrow it plays the movieclip backward. I want you to have to keep clicking on the forward arrow to have it continue animating through the different words. I’ve place stop actions at the points I want the movieclip to stop animating but when you click the forward or backword button it never stops and just plays through the whole thing. Here is my FLA: http://digitalarts.bgsu.edu/portfolios/jimmel/help.fla

Thanks!