function showmail(mail) {
  var result = '';
  var num_out = '';
  var num_in;

  num_out = mail;
  for(i = 0; i < num_out.length; i += 2) {
    num_in = parseInt(num_out.substr(i,[2])) + 23;
    num_in = unescape('%' + num_in.toString(16));
    result += num_in;
    result = unescape(result);
  }
  return result;
}