Snippet that adds "panels" to the body classes of a page if the currently-viewed page is a panel:

function zen_preprocess_page(&amp;$vars, $hook) {<br>&nbsp; $vars['body_classes_array'][] = (module_exists('page_manager') &amp;&amp; (page_manager_get_current_page())) ? 'panels' : ''; // Page is Panels page<br>//&nbsp; $vars['sample_variable'] = t('Lorem ipsum.');<br>}