rule->SetParentRule(parentRule);
aRule->SetParentRule(parentRule);
SetParentRuleReference(nsISupports* aRule, void* aParentRule){  nsICSSRule* rule = NS_STATIC_CAST(nsICSSRule*, aRule);  nsCSSGroupRule* parentRule = NS_STATIC_CAST(nsCSSGroupRule*, aParentRule);  rule->SetParentRule(parentRule);  return PR_TRUE;}