Contacts Tabs

<ul>
        <li><a href="<?php echo $wpcoHtml -> retainquery($_SERVER['QUERY_STRING'], get_permalink($this -> get_option('cartpage_id'))); ?>#contacts-tabs-1"><?php _e('New Customer', $this -> plugin_name); ?></a></li>
        <li><a href="<?php echo $wpcoHtml -> retainquery($_SERVER['QUERY_STRING'], get_permalink($this -> get_option('cartpage_id'))); ?>#contacts-tabs-2"><?php _e('Returning Customer', $this -> plugin_name); ?></a></li>
    </ul>