$form = new Ajax_Form('first', 'first_form', 'post', 'test.php');
$array['first'] = "First Choice";
$array['second'] = "Second Choice";

$params['style'] = "background-color:black;";
$params['align'] = "center";

$form->add_field('username', 'user', 'text');
$form->add_field('password', 'pass', 'password');
$form->add_field('email', 'email', 'select', $array, $params);

$form->open_form();
echo('Username: ');
$form->display_field('user');
echo('<br /> Password: ');
$form->display_field('pass');
echo('<br /> Email: ');
$form->display_field('email');
$form->submit_button('Login');