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