           # UP, LEFT
           @current_stage = @game.prev_stage()
           @update_stage_label()
+          event.preventDefault()
         when 39, 40
           # RIGHT, DOWN
           @current_stage = @game.next_stage()
           @update_stage_label()
+          event.preventDefault()
         when 13
           # ENTER
           @game.switch_scene('game')
+          event.preventDefault()
       false
 
   disable_stage_control: () ->

        when 13
          # ENTER
          @game.switch_scene('stage')
        when 32
          # SPACE
          @toggle_players()

  disable_selection_control: () ->
    $(document).unbind "keydown"

        @map.p1_tank().commander.add_key_event("keyup", event.which)
      if @map.p2_tank()
        @map.p2_tank().commander.add_key_event("keyup", event.which)
      event.preventDefault()
      false

    $(document).bind "keydown", (event) =>
