Piles of images have to be displayed in overlay, how do I put a scroller on thumbnails

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Piles of images have to be displayed in overlay, how do I put a scroller on thumbnails

Fred
Hi,

I need to display a gallery of 30 images in the overlay that pops. Problem is it is only displaying 6 thumbnails when I need it to display 30.

How do I put a scroller on the thumbnail portion of the overlay?

Cheers,