Images for Root Category Names

[Arkidas]

Alright, I know of phpbb board that uses this. They use images for root category titles and I find that very neat. I think it has something to do with <if condition="$forum[forumid]==x"> but can someone tell me how exactly to do this for each root forum category?

Thanks!

http://spjall.vaktin.is

[Dismounted]

There's a hack for this. I don't exactly remember the name though.

[Arkidas]

Well since we don't know that hack, perhaps you know how to do it manually? I'm not speaking of category icons but the thing that's at http://spjall.vaktin.is
I found this hack though, perhaps it is possible to modify it so I can add image instead of color to the root categories?
https://vborg.vbsupport.ru/showthread.php?t=132468