$username = defaults($_REQUEST, 'username' , '');
$email = defaults($_REQUEST, 'email' , '');
$openid_url = defaults($_REQUEST, 'openid_url', '');
$username = defaults($_REQUEST, 'username' , '');
$email = defaults($_REQUEST, 'email' , '');
$openid_url = defaults($_REQUEST, 'openid_url', '');