Horizontal ScrollBar For Image Thumbails

Yes, it’s stupid but I’m having trouble with the concept of putting together a ScrollBar for some thumbnails using AS3.

Here’s what I think might be needed:
a) 1 x MovieClip - with an instance name of let’s say, ScrollBar - obviously, being the scrollbar itself - in my case, i’ll have this as a simple thin line.
b) 1 x Movieclip - with an instance name of Thumbs - inside here, would be more individual MovieClips containing multiple thumbnails (this is the MovieClip that I wish to be scrolled)
c) 1 x Frame on timeline, with ActionScript telling a to find out the width of b and the stage.width.

c is what I’m stuck with. I don’t know what to write for the ActionScript in order to make a a scroller for b.

I’d like the thumbnails to span across the entire stage.Width - i.e. b to be equal to the stage.Width. I think this would be done with this however:

b = Math.round(stage.stageWidth);”
or something like this?)

so it’s not a huge issue!

If anybody knows how the rest of what I wish to create could be created - or any tutorials that could help me - that’d be great!

Thanks,
DC123