if ((nsnull == mImportantRule) && (nsnull != mDeclaration)) {
if (!mImportantRule && mDeclaration) {
nsIStyleRule* CSSStyleRuleImpl::GetImportantRule(void){  if ((nsnull == mImportantRule) && (nsnull != mDeclaration)) {    nsCSSDeclaration*  important = mDeclaration->GetImportantValues();    if (nsnull != important) {      mImportantRule = new CSSImportantRule(mSheet, important);      NS_ADDREF(mImportantRule);    }  }  NS_IF_ADDREF(mImportantRule);  return mImportantRule;}