code: function(el, oRecord, oColumn, oData) {
          el.innerHTML = oData === undefined ||
                         oData === null ||
                         (typeof oData === 'number' && isNaN(oData)) ?
                         "&#160;" : oData.toString();
      }
docs: Default cell formatter
  
  @method DataTable.formatDefault
  @param el {HTMLElement} The element to format with markup.
  @param oRecord {YAHOO.widget.Record} Record instance.
  @param oColumn {YAHOO.widget.Column} Column instance.
  @param oData {Object} (Optional) Data value for the cell.
  @static