code: function (val) {
              var carousel = this,
                  numVisible = val;
  
              if(JS.isArray(val)) {
                  carousel._cols = val[0];
                  carousel._rows = val[1];
                  numVisible = val[0] *  val[1];
              }
              return numVisible;
          }
docs: Set the value for the number of visible items in the Carousel.
  
  @method _numVisibleSetter
  @param val {Number} The new value for numVisible
  @return {Number} The new value that would be set
  @protected