Stopping movie clip after a specified number of seconds

Hi all,

I am not good at actionscript. I use FlashMX and made a basic flash movie with one movie clip. (movie clip contains frame by frame animation using images rendered at AE) How can I make the movie clip stop after a specified number of seconds? Client wants to be able to change the seconds when needed. So a text file along with swf file including number of seconds…?

Thanks a lot in advance…