Let's say a photo album is full of 1024 x 768 pics.  The main pic displays fine.  But -- the 'previous' and 'next' thumbnail pics that are seen in the lower-left and lower right corners are both perfectly square, and the sides of these thumbnail pics are cropped off.

I apologize if this has an obvious answer, but I _have_ searched, and have not seen the answer.  Where can we set those thumbnails to display using the picture's original dimensions, so that there is no cropping?  Thanks!!