hmm...
i have few more questions..

--- is the define of "TRISB.0= 0" and "TRISB.1= 0" is useless...
--- should i delete the "RETURN"...
--- is it suitable to use "IF..THEN...".....how about "FOR...TO...NEXT"
--- is the define of "OSC 4" is useless...

thanks for helps..^^