1. Create a STOP layer on your animation timeline.
2. Control click and select actions.
3. Under TIMELINE CONTROL in the upper left hand corner double click STOP.
To create ACTION SCRIPT for your button do the following:
1. Click the frame that your button appears in the timeline.
2. Select directly on your button you have created down in the work area (not on the timeline).
3. Control Click>Actions
4. Under MOVIE CLIP CONTROL select ON and then RELEASE