I've got some images in the CG Products module, and some are either small or tall/skinny.
I tried hunting through the .js for a few different parts of fancybox, (jquery.fancybox-1.3.1.pack.js) and found an area
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d.width=Math.round(o*(d.width-r))
(It's not directly controlled by CSS, as the div has the style defined within it's element, and is different for every image).