function total_images() {
        global $wpdb;
        $images=  $wpdb->get_var("
                SELECT COUNT(ID) FROM $wpdb->posts
                WHERE (post_mime_type LIKE 'image/%')
                AND post_type = 'attachment'
                AND (post_status = 'inherit')
                AND post_parent > 0
        ");
        echo 'total attached images= '. $images;
}