Hi with this code:
<xen:if is="!{$visitor.is_admin} OR {$visitor.is_moderator}">
<xen:if is="!in_array({$contentTemplate}, array('message_page', 'error', 'search_form', 'search_form_post', 'search_form_profile_post', 'search_results', 'register_form', 'register_facebook', 'register_twitter'...