scene tracking

I have an interactive story divided into scenes. At the end of each scene a button appears. This occurs on a frame on the timeline.

There are two different buttons that might appear based on whether a prior scene has been viewed or not.

For example, there are Scene_1 and Scene_2. At the end of Scene_2 one of two buttons will appear. The buttons will be either "Go see Scene_1" or "Return to Main Menu".

If the user has already seen Scene_1, Flash will know that and automatically go to the frame in Scene_2 that contains the button "Return to Main Menu".

Conversely, if the user has not seen Scene_1, Flash will know and automatically go to the frame in Scene_2 that contains the button "Go see Scene_1".

I imagine there would be an action frame at the end of Scene_2 that will contain the as2 code to enable this action.

Perhaps something like, but probably not at all like the following:

if ("Scene_1", last frame == true){gotoAndPlay("frame#");}else{gotoAndPlay("fra me#");}

Any help is greatly appreciated.

Thanks!
Jerry T