I'll look into it, you would have to add some target code I'm guessing that would say load a new browser page. aka something like target"_blank" I didn't write the thumbnailer it's self however, you could possible setup when you setup your templates to load a new page there.
Again I'll look into it and post what I find
Update:
I'm currently working on a update and testing this with phopost 4.0 pro.. so many have to post a 1.1 version of this script.