what i would do is make a movie clip and on each frame of that movieclip (or MC for short from now on), make 1 button that takes you a scene, or frame in your movie. then go outside of that mc and make 2 triangle buttons; one pointing right of the scene select mc and one pointing to the left like so:
give the Scene select MC an instance name of "ssl" no quotes.
the arrows will be used for selecting the scene. on the left arrow, put this code:
on the right arrow, put this code:
Hope this Helps!