aMember (site.php): Add popup window to Thank you page

site.php

<?php

Am_Di::getInstance()->blocks->add('thanks/success', new Am_Block_Base(null, 'thanks-popup', null, function (Am_View $v) {
    /* @var Invoice $invoice */
    $invoice = $v->invoice;
    /* @var User $user */
    $user = $invoice->getUser();

    return <<<CUT
<div id="thanks-popup">Any Content within Popup</div>
<script type="text/javascript">
    jQuery(function(){
        jQuery('#thanks-popup').amPopup({
            title: 'Popup Title'
        });
    });
</script>
CUT;

}));