function valid_email(s) {
  // this is not to RCS standard because it will not permit a comma in a user name
  var addresses = s.split(',');
  var email = /^\s*[^\s@]+@([^@\s.]+\.)+[^@\s.]{2,3}\s*$/;
  for (i = 0; i < addresses.length; i++) {	
    address = addresses[i];
    if (address.match(email) == null) {
      return false;
    }
  }
  return true;
}

function isNum(passedVal) { 
  if (passedVal == "") {
    return false;
  }
  for (i=0; i<passedVal.length; i++) {
    if (passedVal.charAt(i) < "0" ) {
      return false;
    }
    if (passedVal.charAt(i) > "9") {
      return false;
    }
  }
  return true;
}

function valid_phone(s) {
  if(s == "") {
    return false;
  }
  if (isNum(s)) {
    return true;
  }
  else {
    return false;
  }
}