{ return nsGenericContainerElement::GetPreviousSibling(aPreviousSibling); }
{ return nsGenericElement::GetPreviousSibling(aPreviousSibling); }
  NS_IMETHOD    GetPreviousSibling(nsIDOMNode** aPreviousSibling)  { return nsGenericContainerElement::GetPreviousSibling(aPreviousSibling); }