code: function (cfg) {
              var carousel = this;
  
              if (cfg.prev) {
                  Event.on(cfg.prev, "click", scrollPageBackward, carousel);
              }
              if (cfg.next) {
                  Event.on(cfg.next, "click", scrollPageForward, carousel);
              }
          }
docs: Set the value for the Carousel's navigation.
  
  @method _setNavigation
  @param cfg {Object} The navigation configuration
  @return {Object} The new value that would be set
  @protected