<?php
$q = "SELECT  `contentid`
        FROM  aska1_site_tmplvar_contentvalues
        WHERE `tmplvarid`=59 AND `value`=1
        ";
$qery = $modx->db->query($q);
while ($res = $modx->db->getRow($qery)) {
    $bigres[] = $res[contentid];
}
if ($bigres > 0) {
    $ids = implode(",", $bigres);
    ?>
    <ul id="coverflow2">
        <?php
        echo $modx->runSnippet('Ditto', array(
            'documents' => $ids,
            'depth' => '0',
            'tpl' => 'ditto_rotator',));
        }
        ?>
    </ul>