Question about scrollbar-like functions

ok, thats what i want to do: i got some symbols and each of them should merge into another in a kinda morphing way which is controlled by a scroll bar (the current symbol changes into another as you move the scrollbar - NO fwd and back buttons, only a single sliding bar you can move left or right).
it should work something like the scrollPane thing, but instead of just moving the movieclip around, using the scrollbar should switch between the single images of the movieclip (like in the timeline window of flash where you can switch between frames with a red line).
don’t have to use movieclips at all costs^^ i just need SOME way of doing this. hope you get the idea.