I'm loooking for something like "Lightbox Slideshow" or "Fancybox". With one simple twist, that none of the sliders I've found so far seems to offer:

I want to show multiple Images, represented by 1 Thumbnail

Example:

Category 1

Item 1

Item 2

Item 3

On the Site there should be 2 thumbs visible: Category 1 and Category 2. When I click on one of them, the relating Items 1 to 3 should be displayed in a slideshow with next and prev buttons.

I hope I have made myself clear. Does anybody know of a slideshow plug-in with which this can be accomplished? Thakns