Can I change the pop up size for the product image on the product detail page using a custom skin?

PRESSERO > *Pressero FAQs
If your site uses a custom skin, you can change the size of the enlarged product image that appears when clicking on the product image on the product detail page.  To do this, use this link:
http://moriarty.v4.pressero.com/doc/product.htm#productimage

Change "rel image size" to one of the possible image sizes indicated on this link:
http://moriarty.v4.pressero.com/doc/exampleLayouts.htm