Do anybody know how to control the frame rates???

Now I have a panel of 3 components,
- 1 display area for playing moive
- 1 text area for input the frame rate
- 1 "play" button for starting playing movie.

can I set the frame rate of the movie making use of the input value?

"I cannot find any method in "Flash 5" to change the frame rates during run-time."