With Form2Flash you can change movies using input from forms.
This example shows two things: you can start a movie at any label you want,
and while the movie is playing you can jump to a label of your choice.
The demo shows a simple animated rainbow, looping forever. The animation
starts at the color you selected, and when you click on it will jump to that
color.
Make a Flash file. Open the Properties of a frame and create a Goto action
for that frame. Select "Label" and enter (something like) "<macro Frame>"
in the field. You will probably also want to activate the "Goto and Play"
control.
Give all frames that you want to jump to a label.
Export the movie as a Flash Generator template (*.swt).
Follow the directions in
Using Form2Flash
to create a form that will start the movie.