code: function(row) {
      var elRow = this.getTrEl(row);
  
      if(elRow) {
          var oRecord = this.getRecord(elRow);
          Dom.removeClass(elRow,DT.CLASS_HIGHLIGHTED);
          this.fireEvent("rowUnhighlightEvent", {record:oRecord, el:elRow});
          return;
      }
  }
docs: Removes the class YAHOO.widget.DataTable.CLASS_HIGHLIGHTED from the given row.
  
  @method unhighlightRow
  @param row {HTMLElement | String} DOM element reference or ID string.