if($_REQUEST['message'] == 'cloned') {
	print '<div id="message" class="updated fade"><p>' . t('Survey cloned (ID <strong>'). $_REQUEST[survey] . t('</strong>). Maybe you have to rename it (action <strong>Edit</strong>).') .'</p></div>';
}

<th scope="col" colspan="4"><?php e('Action') ?></th>

	<td>
         <form action="<?php echo $wpframe_plugin_folder?>/survey_action.php" method="post" style="display: inline;">
            <span class="submit">
            <?php wp_nonce_field('surveys_create_edit_survey'); ?>
            <input id="survey" name="survey" value="<?php echo $survey->ID?>" type="hidden">
            <input id="survey" name="action" value="clone" type="hidden">
            <input name="submit" value="Clone" type="submit">
            </span>
            </form>
        </td>

	} else if ($_REQUEST['action'] == 'clone') {
	    // original survey
        $template_id_survey = $_REQUEST['survey'];
 
        // Cloning survey
        $wpdb->query($wpdb->prepare("INSERT INTO {$wpdb->prefix}surveys_survey (name, description, final_screen, status, added_on, type, max_attempts, min_rate)
        SELECT CONCAT('COPIA DI ', name, ' ". date(His)."'), description, final_screen, status, NOW(), type, max_attempts, min_rate FROM {$wpdb->prefix}surveys_survey WHERE ID = %d", $template_id_survey));
        $clone_id_survey = $wpdb->insert_id;
 
        // Cloning questions
        $template_questions = $wpdb->get_results($wpdb->prepare("SELECT ID FROM {$wpdb->prefix}surveys_question WHERE survey_id=%d ORDER BY ID ASC", $template_id_survey));
 
        foreach ($template_questions as $template_quest) {
            $wpdb->query($wpdb->prepare("INSERT INTO {$wpdb->prefix}surveys_question (survey_ID, question, allow_user_answer, allow_multiple_answers)
        SELECT $clone_id_survey, question, allow_user_answer, allow_multiple_answers FROM {$wpdb->prefix}surveys_question WHERE ID = %d", $template_quest->ID));
            $justclone_id_quest = $wpdb->insert_id;
 
            // Cloning answers
            $template_answers = $wpdb->get_results($wpdb->prepare("SELECT ID FROM {$wpdb->prefix}surveys_answer WHERE question_ID =%d ORDER BY ID ASC", $template_quest->ID ));
            foreach ($template_answers as $template_answer) {
                $wpdb->query($wpdb->prepare("INSERT INTO {$wpdb->prefix}surveys_answer (question_ID, answer, correct, sort_order)
        SELECT %d, answer, correct, sort_order FROM {$wpdb->prefix}surveys_answer WHERE ID = %d", $justclone_id_quest, $template_answer->ID ));
            }
        }
 
        wp_redirect($wpframe_wordpress . '/wp-admin/edit.php?page=surveys/survey.php&message=cloned&survey='.$clone_id_survey );