Hello all! I'm new to Zen Cart, I already ordered a book, but Amazon takes for ever to ship.

On the following link there is a thumbnail image. When a user clicks on it a window will pop-up to give a preview of the image, but the image preview is the same size as the thumbnail.

How do I make the image inside the pop-up window bigger?

http://fairviewphotogallery.com/phot...&products_id=6