It doesn't seem to be working at the moment.
I take that back, it does work for ebooks. Not for google preview, though. Will have to see if this is possible.
Created attachment 2885 [details] [review] Proposed patch
I have fixed the whitespace errors and signed off - I hope I did that edits right :)
Pushed please test
This bug is mentioned in: Bug 5522 - allow google preview to open in a new window http://lists.koha-community.org/pipermail/koha-patches/2010-December/013432.html Bug 5522 - allow google preview to open in a new window http://lists.koha-community.org/pipermail/koha-patches/2010-December/013427.html