The width of 112 and height 155 are the thumb boxes on right as you see it on that first line. The change is to the big image on left and mouseover is doing the substitution of one URL for another. I'm thinking you should stick with the same 96x96 tag names regardless of size, as it appears the code does the sizing for display. It's more a tag than a real size for the purpose of use as a URL. I just thought it easier to pick one, and the thumbs won.
Danno