Thread:Extension talk:CategoryTree/Icons instead of C, P, F.

Not a techie guy so my question is rather than simple: is it possible to replace the text from the system messages with images?

More specific, the problem seems to be that when MediaWiki:Categorytree-member-num (or mediawiki:categorytree-num-xxx) is edited, it ignores any wiki code so it donesn't have any effect. Example: $1 &#91;] will render as it is, with no image at all. HTML tags are ignored too.

With no wiki code or html working, I ran out of ideas. I'd like to know if there is a way to sort this out...?

Thanks in advance.