i just wanna to blink this microcontroller !

[SIZE=2];WORLDS SIMPLEST PROGRAM             *[/SIZE]
[SIZE=2];  18-5-2010                         *[/SIZE]
[SIZE=2];                                    *[/SIZE]
[SIZE=2];************************************[/SIZE]
 
[SIZE=2]list p=12F629[/SIZE]
[SIZE=2]radix dec[/SIZE]
[SIZE=2]include "p12f629.inc"[/SIZE]
 
 
 
[SIZE=2]__CONFIG _MCLRE_OFF & _CP_OFF & _WDT_ON & _INTRC_OSC_NOCLKOUT  ;Internal osc.[/SIZE]
 
[SIZE=2];************************************[/SIZE]
[SIZE=2];Beginning of program[/SIZE]
[SIZE=2];************************************[/SIZE]
[SIZE=2]  org  0x00[/SIZE]
[SIZE=2]  bsf  status, rp0    ;bank 1  [/SIZE]
[SIZE=2]  bcf  TRISIO,4      ;GP4 output  [/SIZE]
[SIZE=2]  movlw   b'00000111'     ;bit3=1=WDT  011= /8 WDT=18mSx8=0.144Sec[/SIZE]
[SIZE=2]  movwf   option_reg      ;must be in bank 1[/SIZE]
[SIZE=2]  bcf  status, rp0  ;bank 0 [/SIZE]
[SIZE=2]  movlw b'00010000'  ;to toggle GP4[/SIZE]
[SIZE=2]  xorwf GPIO,f[/SIZE]
[SIZE=2]  sleep[/SIZE]
 
[SIZE=2]END[/SIZE]