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Thank you! I turns out [ &sout=1 ] is the parameter you need to use to search through the old layout. This search engine brilliantly adds that to the address, like this search for "volcano":

http://www.google.com/images?sout=1&q=volcano

I have added this as a bookmark, so that I can simply type "gim volcano" in the address bar to search in the old layout (or whatever keyword you specify instead of "gim"), no search box needed:

http://www.google.com/images?q=%s&sout=1

The %s marks where "volcano" or any other search word is inserted.