I'm still learning myself but i hope this works for your need or is a good pointer. This i have test and works on my development board. Each time you push the switch on the Interupt pin, the LEDs on PORTB light in sequence as you push the switch.

Code:
' I/O definition
'
TRISB = %10000001   ' Set PORTB (0)INPUT (1-5)OUTPUTS

' Variable Definition
'
Switch              VAR PORTB.0
PushHowManyTimes    VAR Byte

' register and interrupt definition
'
CMCON = 7          ' Disable analog comparator on PORTA... not needed as now
OPTION_REG=0       ' enable pull-up resistor on PORTb
                   ' Interrupt on falling edge of RB0
INTCON = %10010000 ' Enable RB0 interrupt

On Interrupt Goto ProcedureSwitcher

' Variable initialisation
'
PORTB=0             ' Reset all outputs on PORTB
PushHowManyTimes=0

'Main Procedure
'
MainProcedure:
      Select Case PushHowManyTimes
             case 1
                  Gosub Routine_1 
             Case 2
                  Gosub Routine_2
             Case 3
                  Gosub Routine_3
             Case 4
                  Gosub Routine_4
             Case 5
                  Gosub Routine_5
             End Select
Goto Mainprocedure

Routine_1:
    High 1
Return

Routine_2:
    High 2
Return

Routine_3:
    High 3
Return

Routine_4:
    High 4
Return

Routine_5:
    High 5
Return

' Interrupt handler stuff here
'
Disable                                     ' Disable interrupts in handler
ProcedureSwitcher:
    PushHowManytimes=PushHowManytimes+1     ' Changing task
    If PushHowManytimes=6 Then PushHowManytimes=1
Here:
    While SWITCH = 0                        ' waiting until
    wend                                    ' push-button is release
    pause 100                               ' debounce time
    If switch=0 then here
    INTCON.1=0                              ' reset RB0 interrupt flag
Resume                                      ' Return to main program

Enable                                      ' Enable interrupts after
                                            ' handler
As i say, still learning myself, but willing to help where i can !!

Regards,

Steve