Dave, use <code> tags and format your code - makes it easier to read.
Code:
ANSEL  = %00000000 'disable analog select so ports work as digital i/o
CMCON0 = %00000111 'Disable analog comparators
TRISIO = %11001111 'Set GPIO.4&5 to input
GPIO   = %00000000 ' set all outputs low

i VAR BYTE

START
Main:
pause 500          'pause 500 mili-secs
For i = 1 to 3     ' loop count variable (value i) also number of times to loop.
  LOOKUP i, [ 223, 223, 223] ,GPIO      '223 = %11011111 D0 switches on (GPIO.4)
  Pause 500        'pause 500 mili-secs
  LOW GPIO.4       ' DO switches off
Next i             ' loop again. ONE is added to count i and prog jumps to FOR