We are going to assign one action to your overall scene, though, so if you have more than two options for your user choice, go ahead and create all of the buttons for those before we move on.
When you're finished, create a new layer and label it "Actions". We're going to insert our first ActionScript command; while many times when working with ActionScripting you're going to have to assign actions that affect a particular frame on a particular layer for a particular object, for actions that affect our overall movie/scene I prefer to keep a separate layer. It makes things cleaner.
Insert a keyframe on your very last frame, because that's where we want our action to take place.
