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<ul>
    <li class="first">
        <a id="toggle-lang" href="#toggle-lang"><?php print t('Le llamamos'); ?></a>
    </li>
</ul>
<script type="text/javascript">
    (function ($) {
        Drupal.behaviors.mfs_mobile_lang_toggle = {
            attach: function (context, settings) {
                $("#toggle-lang").click(function() {
                    $(".blok-le-llamamos-mobile").slideToggle('fast');
                    return false;
                });
            }
        };
    })(jQuery);
</script>