OK, here's the overcomplicated solution first...
Code:
    @ __CONFIG  _INTRC_OSC_NOCLKOUT & _MCLRE_ON  &  _LVP_OFF & _WDT_OFF & _PWRTE_ON  & _BODEN_ON  
    PORTA = 0
    PORTB = 0
    TRISA = 0
    TRISB = 0
    CMCON = 7
    
    CounterA    var byte
    GOTO START
@   IFNDEF KAPOUET
        PAUSE 0     ' include PAUSE?C macro
@   ENDIF
ASM

        
ON=1
OFF=0
BLINK=2

CLEARALL    MACRO
   VARIABLE CLEARCOUNTER
CLEARCOUNTER=1
    WHILE (CLEARCOUNTER<13)    
        LED#v(CLEARCOUNTER) OFF
CLEARCOUNTER++=1
    ENDW
    ENDM
            
LED     MACRO  LEDOUT,ACTION,DELAY
    IF (ACTION == BLINK)
        LED#V(LEDOUT) ON
        PAUSE?C DELAY
        LED#V(LEDOUT) OFF
        ELSE
            LED#V(LEDOUT) ACTION
            PAUSE?C DELAY
        ENDIF
    ENDM
    
LED1    MACRO ACTION
    MOVE?CT 0,TRISB,0
    MOVE?CT ACTION,PORTB,0
    ENDM

   
LED2    MACRO ACTION
    MOVE?CT 0, TRISB,1
    MOVE?CT 0, TRISB,2
    MOVE?CT ACTION,PORTB,1
    MOVE?CT 0,PORTB,2
    ENDM
    
LED3    MACRO   ACTION
    MOVE?CT 1, TRISB,1
    MOVE?CT 0, TRISB,2
    MOVE?CT ACTION, PORTB,2   
    ENDM

LED4    MACRO ACTION
    MOVE?CT 0,TRISB,3
    MOVE?CT ACTION,PORTB,3
    ENDM

LED5    MACRO ACTION
    MOVE?CT 0, TRISB,4
    MOVE?CT 0, TRISB,5
    MOVE?CT ACTION,PORTB,4
    MOVE?CT 0,PORTB,5
    ENDM
    
LED6    MACRO   ACTION
    MOVE?CT 1, TRISB,4
    MOVE?CT 0, TRISB,5
    MOVE?CT ACTION, PORTB,5
    ENDM

LED7    MACRO ACTION
    MOVE?CT 0, TRISB,6
    MOVE?CT 0, TRISB,7
    MOVE?CT ACTION,PORTB,6
    MOVE?CT 0,PORTB,7
    ENDM
    
LED8    MACRO   ACTION
    MOVE?CT 1, TRISB,6
    MOVE?CT 0, TRISB,7
    MOVE?CT ACTION, PORTB,7
    ENDM
    
LED9    MACRO ACTION
    MOVE?CT 0,TRISA,0
    MOVE?CT ACTION,PORTA,0
    ENDM

LED10    MACRO ACTION
    MOVE?CT 0, TRISA,1
    MOVE?CT 0, TRISA,2
    MOVE?CT ACTION,PORTA,1
    MOVE?CT 0,PORTA,2
    ENDM
    
LED11    MACRO   ACTION
    MOVE?CT 1, TRISA,1
    MOVE?CT 0, TRISA,2
    MOVE?CT ACTION, PORTA,2
    ENDM    

LED12    MACRO ACTION
    MOVE?CT 0,TRISA,3
    MOVE?CT ACTION,PORTA,3
    ENDM        
ENDASM    
    

               
START:
    for countera =1 to 10
        ASM
            LED 1,ON,0
            LED 4,ON,0
            LED 7,ON,0
            LED 10,ON,250
            CLEARALL
            
            LED 2,ON,0
            LED 5,ON,0
            LED 8,ON,0
            LED 11,ON,250
            CLEARALL
            
            LED 3,ON,0
            LED 6,ON,0
            LED 9,ON,0
            LED 12,ON,250
            CLEARALL
        ENDASM        
        next

    FOR COUNTERA= 1 TO 10
    asm
    variable CLED
CLED=1

    while (CLED<13)
       LED CLED,BLINK,250
CLED++=1
    ENDW
CLED=11    
    while (CLED>1)
       LED CLED,BLINK,250
CLED--=1
    ENDW    
    ENDASM            
    NEXT
    GOTO START
now, i'll try to do something more 'user friendly