mContent->QueryInterface(kIDOMHTMLHRElementIID, (void**) &hr);
mContent->QueryInterface(NS_GET_IID(nsIDOMHTMLHRElement), (void**) &hr);
HRuleFrame::GetNoShade(){  PRBool result = PR_FALSE;  nsIDOMHTMLHRElement* hr = nsnull;  mContent->QueryInterface(kIDOMHTMLHRElementIID, (void**) &hr);  if (nsnull != hr) {    hr->GetNoShade(&result);    NS_RELEASE(hr);  }  return result;}