id == sLength_id);
id == sLength_id       || id == sFrames_id);
  static inline PRBool IsReadonlyReplaceable(jsval id)  {    return (id == sTop_id          ||            id == sScrollbars_id   ||            id == sContent_id      ||            id == sSidebar_id      ||            id == sMenubar_id      ||            id == sToolbar_id      ||            id == sLocationbar_id  ||            id == sPersonalbar_id  ||            id == sStatusbar_id    ||            id == sDirectories_id  ||            id == sControllers_id  ||            id == sScrollX_id      ||            id == sScrollY_id      ||            id == sLength_id);  }