NS_METHOD AppendChild(nsIDOMNode* aNewChild, nsIDOMNode** aReturn) { return nsGenericElement::doInsertBefore(this, aNewChild, nsnull, aReturn);
NS_METHOD AppendChild(nsIDOMNode* aNewChild, nsIDOMNode** aReturn) { return NS_ERROR_FAILURE;
  NS_METHOD AppendChild(nsIDOMNode* aNewChild, nsIDOMNode** aReturn)  {    return nsGenericElement::doInsertBefore(this, aNewChild, nsnull, aReturn);  }