I am working on a single axis solar tracker but I am having trouble adding hysteresis to my project. I am using a PIC16F688.

Code:
' * James Richards *
' * Solar Tracker  *
' * 5/21/10        *

'----------Configuration----------
INTCON = $80
ANSEL  = %00010100
ADCON1 = %00010000
'----------Variables--------------
ADCVAL1 var word
ADCVAL2 var word
RANGE   VAR WORD
'----------Program---------------- 
MAIN:
     
     ADCON0 = %10001001
     
     ADCON0.1 = 1
     NOTDONE1:
     pauseus 25
     if ADCON0.1 = 1 then notdone1
     
     ADCVAL1.highbyte = ADRESH
     ADCVAL1.lowbyte  = ADRESL
     
         ADCON0 = %10010001
         
         ADCON0.1 = 1
         NOTDONE2:
         pauseus 25
         if ADCON0.1 = 1 then notdone2
         
         ADCVAL2.highbyte = ADRESH
         ADCVAL2.lowbyte  = ADRESL
'---------------------------------
GREATER:
range = ADCVAL2 - adcval1
if (RANGE > 10) then cw 

LESSER:
range = ADCVAL1 - adcval2
if (RANGE > 10) then ccw

goto stay 

CCW:
high PORTC.2
low PORTC.3
pause 100
goto main

CW:
low PORTC.2
high PORTC.3
pause 100
goto main

STAY:
low PORTC.2
low PORTC.3
goto main
     

     
end