/// 

      /// Finds a title of HTML file. Doesn't work if the title spans two or more lines.
      /// 
      /// HTML document.
      /// Title string.
      private string getTitle(string html)
      {
         Match m = Regex.Match(html, "");
         if (m.Groups.Count == 2)
            return m.Groups[1].Value;
         return "(unknown)";
      }