<?

$post_id = 0;

$template_file = "";
if ( isset($_GET['action']) ) :

    if ($_GET['action'] == 'edit' ) {
        if ( isset( $_GET['post'] ) ) $post_id = $_GET['post'];
            elseif ( isset( $_POST['post_ID'] ) ) $post_id = $_POST['post_ID'];
        if ( isset($post_id) ) $template_file = get_post_meta($post_id,'_wp_page_template',TRUE);
    }

endif;



if ($template_file == 'page-a-usina.php') :

    .........

endif;


?>