Yours suggestion have been already asked :

https://forums.mirc.com/ubbthreads.php?ub...true#Post185716

https://forums.mirc.com/ubbthreads.php?ubb=showflat&Board=6&Number=154242&Searchpage=1&Main=28782&Words=%2Btreebar+%2Bbackground&topic=0&Search=true#Post154242

#mircscripting @ irc.swiftirc.net == the best mIRC help channel