Code:
' Example program from manual to blink an LED connected to PORTB.0 about once a second

loop:   High 0          ' Turn on LED connected to PORTB.0
        Pause 500       ' Delay for .5 seconds

        Low 0           ' Turn off LED connected to PORTB.0
        Pause 500       ' Delay for .5 seconds

        Goto loop       ' Go back to loop and blink LED forever
        End
http://www.melabs.com/resources/samples.htm#pro


Hope this helps..