code: function(map, markers) {
  			this.writeDebug('visibleMarkersList',arguments);
  
  			if (this.settings.visibleMarkersList !== true) {
  				return;
  			}
  
  			var _this = this;
  
  			// Add event listener to filter the list when the map is fully loaded
  			google.maps.event.addListenerOnce(map, 'idle', function(){
  				_this.checkVisibleMarkers(markers, map);
  			});
  
  			// Add event listener for center change
  			google.maps.event.addListener(map, 'center_changed', function() {
  				_this.checkVisibleMarkers(markers, map);
  			});
  
  			// Add event listener for zoom change
  			google.maps.event.addListener(map, 'zoom_changed', function() {
  				_this.checkVisibleMarkers(markers, map);
  			});
  		}
docs: Visible markers list setup
  
  @param map {Object} Google map
  @param markers {Object} Map markers