Flash 2.0 button back to previous frame

I have a project that have lots of Scenes (50 or so with lots of buttons that link to movies, in most cases I have several buttons linking to the same movie)
So…
I created a scene called “movies”
I have about 90 movies
on each frame (90 blank keyframes) with a stop action , FLV Move Progressive download, and a back Button on each frame

when the user clicks on a that back button I want the program to go back where the user just was, Not the Previous Frame with in the timeline or scene.

Please Respond in detail: I am still very new to Flash

if anyone can help…
thank you!:beer2: