docs: function(indexer, newNode, nextNode) {
          var returnVal = OpenLayers.ElementsIndexer.IndexingMethods.Z_ORDER(
              indexer, 
              newNode, 
              nextNode
          );
          
          // Make Z_ORDER subscribe to drawing order by pushing it above
          // all of the other nodes with the same z-index.
          if (nextNode && returnVal == 0) {
              returnVal = 1;
          }
          
          return returnVal;
      }