debouncing switches with a timer interrupt?

[DDDvvv]

hi all
i tried to implement the flag idea, but still the same result. menu item cycles through 3 to 6 items with one push of a button. here's the code snippet

RB_MainMenuLoop:
' BTN_PLUS is the Next Choice button
    PAUSE 1
      IF BTN_PLUS=0 THEN
      ;PAUSE 200
      IF FLAG_PLUS = 0 THEN
      bMenuPos=bMenuPos+1
      FLAG_PLUS = 1
      ELSE 
      FLAG_PLUS = 0
      IF BTN_PLUS = 0 THEN FLAG_PLUS = 1
      ;ENDIF
      IF bMenuPos>22 THEN
         bMenuPos=1
      ENDIF
      ENDIF
      Goto DisplayMainMenuLoop:
   ENDIF

im beginning to think that debouncing is not the problem. is there any other way to skin this cat?