I'm working on a Flash CS4 file, and I have to add in back and forth buttons. I can't seem to find a tutorial to help me do this?

The problem is that the gallery that I want to be able to go "back" and "forth" in, is a UI loader and UI ScrollPane. Basically, the scrollpane at the bottom loads in thumbnails that when the user clicks on them, it loads a larger image within a UI Loader.

How do I add in buttons to this gallery, or where can I find a tutorial, that will help me figure out how to add in back/forth buttons to that the user has the option to either click on the buttons, OR use the scrollpane to go through the images? Is this even possible?

thanks so much!