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Looks to me like maybe the number of thumbnails you add does not matter, the scroll looks like it is being set in the script on the leftscroll and rightscroll mc’s. If you look at the code, the scroll stops when the x value of the scroll image reaches a certain value. I would think that you should just be able to add images to the scroll movie clip and it would work, but I did not try it.
Although now that I think about it more, the values would change if the size of the scroll mc changes. I would play around with these values though, this is what is making it work (as far as I can tell)
