Um........That wouldn't blink the led (which is on PB0?) it would just turn it on permanently.

Your main should be something like...

main:
portb.0 = 1
pause 100
portb.0 = 0
pause 100
goto main


Could also be

main:
portb = 0
pause 100
portb = 1
pause 100
goto main

Hope this helps.
About time I offered some help, instead of just asking for help, for a change.