code: function(tile) {
          tile.unload();
          tile.events.un({
              "loadstart": tile.onLoadStart,
              "loadend": tile.onLoadEnd,
              "unload": tile.onLoadEnd,
              "loaderror": tile.onLoadError,
              scope: this
          });
      }
docs: Method: removeTileMonitoringHooks
  This function takes a tile as input and removes the tile hooks
  that were added in addTileMonitoringHooks()
  
  Parameters:
  tile - {<OpenLayers.Tile>}