rv = cont->QueryInterface(NS_GET_IID(nsIDOMElement), (void **)result);
rv = CallQueryInterface(cont, result);
NS_IMETHODIMP nsPluginInstanceOwner::GetDOMElement(nsIDOMElement* *result){  NS_ENSURE_ARG_POINTER(result);  nsresult rv = NS_ERROR_FAILURE;  *result = nsnull;  if (nsnull != mOwner) {    nsIContent* cont = mOwner->GetContent();    if (cont) {      rv = cont->QueryInterface(NS_GET_IID(nsIDOMElement), (void **)result);    }  }  return rv;}