The thing needed to be done is to use the variable that the category number is saved in and check for some file like cat2.gif for a category with the number 2.
I'll make the addition to the code to allow category images as well and release a new version.
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.