code: function(row, col) {
          var origin = this.getTileOrigin();
          var tileLayout = this.gridLayout;
          var tilelon = tileLayout.tilelon;
          var tilelat = tileLayout.tilelat;
          var minX = (tileLayout.startcol + col) * tilelon;
          var minY = (tileLayout.startrow - row) * tilelat;
          return new OpenLayers.Bounds(
              minX, minY,
              minX + tilelon, minY + tilelat
          );
      }
docs: Method: getTileBoundsForGridIndex
  
  Parameters:
  row - {Number} The row of the grid
  col - {Number} The column of the grid
  
  Returns:
  {<OpenLayers.Bounds>} The bounds for the tile at (row, col)