NS_IMETHOD ReplaceChild(nsIDOMNode* aNewChild, nsIDOMNode* aOldChild, nsIDOMNode** aReturn) { return nsGenericElement::doReplaceChild(aNewChild, aOldChild, aReturn);
nsGenericElement::ReplaceChild(nsIDOMNode* aNewChild, nsIDOMNode* aOldChild, nsIDOMNode** aReturn) { if (!aReturn) { return NS_ERROR_NULL_POINTER;
  NS_IMETHOD ReplaceChild(nsIDOMNode* aNewChild, nsIDOMNode* aOldChild,                        nsIDOMNode** aReturn)  {    return nsGenericElement::doReplaceChild(aNewChild, aOldChild, aReturn);  }