function valid_tel(tel)
  {
    re = /^[0-9-_ *()\]\[]{5,}$/ig;
    if (!re.test(tel)) {
        return false;
    }
    return true;
  }
  
  function valid_email(email)
  {
    re = /^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z0-9]{2,10})$/ig;
    if (email && !re.test(email)) {
        return false;
    }
    return true;
  }