I think it might be Anton's, or partly. Or he had something like it on his site. His was neater though if I remember right - it had the boxes nested and looked interesting. Anton is rather artistic at times.
After that you have to go hunting and find a 2 sets of 3 lines similar to these in your subs.pl the upper and the lower ones, I am not sure if they are different or the same so I will paste them here for you to see... replace lines 792-794 with these lines.