code: function(marker, type) {
          marker = $(marker);
  
          // Stop all the unnecessary processing
          if (type === 'activate' && marker.hasClass('is-stalked')) {
              return;
          } else if (type === 'deactivate' && !marker.hasClass('is-stalked')) {
              return;
          }
  
          var options = this.options,
              targetBy = options.targetBy,
              markBy = options.markBy,
              target = this.targets.filter(function() {
                  return $(this).attr(targetBy).replace('#', '') === marker.attr(markBy);
              }),
              before,
              after,
              method;
  
          if (type === 'activate') {
              before = 'activating';
              after = 'activated';
              method = 'addClass';
          } else {
              before = 'deactivating';
              after = 'deactivated';
              method = 'removeClass';
          }
  
          this.fireEvent(before, [marker, target]);
  
          marker[method]('is-stalked');
          target[method]('is-active');
  
          this.fireEvent(after, [marker, target]);
      }
docs: Either active or deactivate a target based on the marker.
  
  @param {Element} marker
  @param {String} type