# File daybook/mycgi/daybook/base/daybook_mod.rb, line 11
  def m_checking_path_int(del_id, dir, ext)
    unless del_id =~ /\D/ 
      del_path = File.join( dir, del_id + "#{ext}")
      if FileTest.exist?(del_path)
        return del_id
      end
     end
    return ""
  end