Captcha reload problem

I want a link on my user add page to reload a captcha. This is the
code I have in the add.ctp view file:

<div id="captchaID">
<?php echo $this->Html->image($this->Html-
>url(array('controller'=>'users', 'action'=>'captcha'),
true), array('style'=>'','vspace'=>2)); ?>
</div>
<?php echo $this->Js->link('Can not read this code? Reload.',
'reload_captcha', array('update'=>'captchaID')); ?>

... and in my controller:

function captcha() {
$code = $this->Utils->captcha_code();
$this->Utils->render_captcha($code);
$this->Session->write('captcha_code', $this->hash_captcha($code));
}
function reload_captcha() {
$this->captcha();
}

This reloads the captcha, but the captcha is on its own, not in the
form e.g. I have lost the form, it is not redrawn. How can I get the
form to remain?

Thanks.

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