Resize pictures when clicked on from product page 3.0.3.6

Hi I have moved to OC 3.0.3.6 and I need to make the pictures that pop up on the product page when you click on them twice the size. I can not for the life of me find the location of the code that controls the picture size.
thanks in advance
Hemi

Hi

You should be able to manage the image sizes here:
admin panel / extensions / extensions / themes / edit your theme

Thank you for that I seem to spend forever looking for were they have put settings since I upgraded from 2.0.1.1 to 3.0.3.6