nsIDOMNode** aReturn) { return nsGenericElement::doReplaceChild(this, aNewChild, aOldChild, aReturn);
nsIDOMNode** aReturn) { return NS_ERROR_FAILURE;
  NS_METHOD ReplaceChild(nsIDOMNode* aNewChild, nsIDOMNode* aOldChild,                         nsIDOMNode** aReturn)  {    return nsGenericElement::doReplaceChild(this, aNewChild, aOldChild,                                            aReturn);  }