Encoding in UDF's

Hi
I have a postgres compiled with -mb=KOI8, store cyrillic data, get in the
client using different encoding (SET ENCODING=WIN1251, KOI8). The question
is: what should return stored procedure if I want to see it's output in
different encodings? Win1251, KOI8, UTF-8, something else?

Thanks in advance
Andriy Korud, Lviv, Ukraine.