Can anyone tell me if there is a switch in Admin where I can use to specify the size of the image for use at the Product Info. page?

My small and medium image are set to 120px X 120px and 180px X 180px respectively. When I browse to a Product Info. page, the small image is displayed rather that the medium size one. How can I display the medium size image instead? TIA.

P.S. I have installed Image Handler v2.