return NS_ERROR_ILLEGAL_VALUE; }
  nsresult  GetQuotesAt(PRUint32 aIndex, nsString& aOpen, nsString& aClose) const {    if (aIndex < mQuotesCount) {      aIndex *= 2;      aOpen = mQuotes[aIndex];      aClose = mQuotes[++aIndex];      return NS_OK;    }    return NS_ERROR_ILLEGAL_VALUE;  }