Не отображается captcha

        [question]
        <tr>
            <td class="label">
                Вопрос:
            </td>
            <td>
                <div>{question}</div>
            </td>
        </tr>
        <tr>
            <td class="label">
                Ответ:<span class="impot">*</span>
            </td>
            <td>
                <div><input type="text" name="question_answer" class="f_input" /></div>
            </td>
        </tr>
        [/question]
        [sec_code]
        <tr>
            <td class="label">
                Введите код<br />с картинки:<span class="impot">*</span>
            </td>
            <td>
                <div>{reg_code}</div>
                <div><input type="text" name="sec_code" style="width:115px" class="f_input" /></div>
            </td>
        </tr>
        [/sec_code]
        [recaptcha]
        <tr>
            <td class="label">
                Введите два слова, показанных на изображении:<span class="impot">*</span>
            </td>
            <td>
                <div>{recaptcha}</div>
            </td>
        </tr>
        [/recaptcha]