hey sorry need some help on this... been working with timer1 to make leds blink from someone code example in the past. unforunately im a bit stuck

Code:
define OSC 20

TRISA = 0
TRISB = 0


PORTA = 0
PORTB = 0

T1CON = %00110001       ' 0.524ms
TMR1IF VAR PIR1.0       ' Overflow bit of Timer1.

Output1 VAR PORTB.1     ' Blink 6secs.
Output2 VAR PORTB.0     ' Blink 0.5secs.

PreLoad     VAR WORD
TimeCount   VAR BYTE
TimetoBlink VAR BYTE

PreLoad = 0 ' to get 500ms.
TMR1H = PreLoad.HighByte

TimeCount = 0
TimetoBlink = 12 '12 = 6secs.

PAUSE 50         ' OSC to Settle.


Start:


   IF TMR1IF THEN Blink

   GOTO Start
    
    

Blink: 'Each int is 0.500 sec.
    TMR1L = PreLoad.LowByte   ' Load the timer with preload value.
    TMR1H = PreLoad.HighByte
    TimeCount = TimeCount + 1 ' Count interrupts.
    Output2 = Output2 ^ 1     ' Toggle fast blinking output.    

    IF TimeCount = TimetoBlink THEN '6Secs ON, 6secs OFF.
      TimeCount = 0                   
      Output1 = Output1 ^ 1 
    ENDIF
   
    TMR1IF = 0                ' Clear TMR1 int. flag.  
    
    GOTO Start    
    
END
unfortunately the blinks are far too fast.... about 8 to 10x too fast.

my pic is oscillating at 20mhz so i thought id just use that internal oscialltion. when u choose that oscillator it does Fosc/4 so its at 5mhz. with a word size timer1 i can measure up to 65536 ticks; with a 1:8 prescaler on that only takes about 0.7 seconds or something to complete. how do i get it so it will be 6 seconds? cant change prescaler anymore... and preloader wont make a difference since it only speeds up the cycle. i think anyway

any help on this? thanks