function validateForm3(theForm)
{
  // Customize these calls for your form

  // Start ------->
  
	
	
	if (!validRequired(theForm.username,"Username"))
    return false;

	var reUsername = new RegExp(/^[a-z0-9]+$/);

	if (!reUsername.test(theForm.username.value)) {
        alert("The username is not valid. Only lowercase letters and numbers are allowed.");
		theForm.username.focus();
        return false;
    }

	if (!validRequired(theForm.password,"Password"))
    return false;

	var rePassword = new RegExp(/^[A-Za-z0-9]+$/);

	if (!rePassword.test(theForm.password.value)) {
        alert("The password is not valid. Only letters and numbers are allowed.");
		theForm.password.focus();
        return false;
    }

  // <--------- End
  
  return true;
}