code: function(elHdTable, elTable) {
      elHdTable = elHdTable || this._elHdTable;
      elTable = elTable || this._elTable;
      
      // Scrolling body's THEAD
      this._initBdTheadEl(elTable);
      // Standard fixed head THEAD
      SDT.superclass._initTheadEl.call(this, elHdTable);
  }
docs: Initializes ScrollingDataTable THEAD elements into the two inner containers.
  
  @method _initTheadEl
  @param elHdTable {HTMLElement} (optional) Fixed header TABLE element reference.
  @param elTable {HTMLElement} (optional) TABLE element reference.
  @private