Encoding problem when viewing html mail

[<leiralist spymac com>]

i am using fetchmail+esmtp+procmail as my mail system, and i want to us balsa as
my MUA.
i reveive a lot of chinese mail and i little japanese mail(utf-8 or not utf-8),
balsa works well with the plain text mail. but the html part can only show lots
of "?"s. and i didn't found where i can set encoding. 

maybe it is not basa's problem, maybe it is gtkhtml's. but, how can i read the
html in chinese and japanese? or how can i set encoding for each mail?