Hacking Invisionfree

I need to break into an IPB board (v.1.3 final)from a lib computer, and since i have no privs on this one I can't install Perl or anything like that.

Can one use Javascript bookmarks or some portable app to hijack the boards?

And no, newfags, no one falls for tinyURLs or nimp.org.

http://hotaru.thinkindifferent.net/hacking/ipb.html