nsIDOMNode** aReturn) { return NS_ERROR_FAILURE;
nsIDOMNode** aReturn) { return nsGenericElement::doInsertBefore(aNewChild, aRefChild, aReturn);
  NS_METHOD InsertBefore(nsIDOMNode* aNewChild, nsIDOMNode* aRefChild,                        nsIDOMNode** aReturn) {    return NS_ERROR_FAILURE;  }