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submit(string $title, array $options)

Returns a submit button that submits the form to $options['url'] and updates the div specified in $options['update']

<div id='testdiv'>
<?php
echo $form->create('User');
echo $form->input('email');
echo $form->input('name');
echo $ajax->submit('Submit', array('url'=> array('controller'=>'users', 'action'=>'add'), 'update' => 'testdiv'));
echo $form->end();
?>
</div>

1. <div id='testdiv'>
2. <?php
3. echo $form->create('User');
4. echo $form->input('email');
5. echo $form->input('name');
6. echo $ajax->submit('Submit', array('url'=> array('controller'=>'users', 'action'=>'add'), 'update' => 'testdiv'));
7. echo $form->end();
8. ?>
9. </div>

Use the $ajax->submit() method if you want form validation to work properly. i.e. You want the messages you specify in your validation rules to show up correctly.