Flash 5 Drag Mask Tutorial - Page 6

It is now simply a case of adding however many buttons to the navigation movie that you need. Create a shape (As I mentioned before it is best to make it fit within the mask) and make it into a button symbol. Add a layer to the “navigation” movie clip called “buttons”. Place as many instances of the button as you require on this layer. Right click the button and add a keyframe to the “hit” keyframe. Now go back and delete the content of the “Up”, “Over” & “Down” keyframes. This will create an invisible button that will activate when you hit the shape that you have put there.

These buttons can then be assigned any actions that you want.