iframe.phtml

<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Academic Free License (AFL 3.0)
 * that is bundled with this package in the file LICENSE_AFL.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/afl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magento.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magento.com for more information.
 *
 * @category    design
 * @package     base_default
 * @copyright   Copyright (c) 2006-2016 X.commerce, Inc. and affiliates (http://www.magento.com)
 * @license     http://opensource.org/licenses/afl-3.0.php  Academic Free License (AFL 3.0)
 */

?>
<div id="iframe-warning" class="warning-message">
    <?php echo $this->__('Please do not refresh the page until you complete payment.') ?>
</div>
<iframe id="hss-iframe" style="display:none;" scrolling="no" frameborder="0" border="0" src="<?php echo $this->getFrameActionUrl() ?>" height="610" width="100%"></iframe>
<script type="text/javascript">
//<![CDATA[
var headers = $$('#' + checkout.accordion.container.readAttribute('id') + ' .section');
headers.each(function(header) {
    header.removeClassName('allow');
});
$('hss-iframe').observe('load', function(){
    $('hss-iframe').show();
    $('iframe-warning').show();
    checkout.loadWaiting = 'review';
    checkout.setLoadWaiting(false);
    if (checkout.accordion.currentSection == 'opc-review') {
        $('checkout-review-submit').hide();
    }
});
//]]>
</script>