This module (vqmod) brings highslide thumbnail viewer functionality to opencart.
You can see it in action here http://youtu.be/bcWMOODcXyk
Basically it enables to enlarge images on category and manufaturer pages.
If you'll use it on commercial site you'll need to buy a licence from highslide author at http://highslide.com/.
If you have a question, need support or have a feature/extension request please write at: