This hack should work with any version I belive that you have to use version 4 or above of the browser, which I assume every one does this days. Try adding the code to the header of the forums (not that I see any diffrent) rather then the main header.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.