Комментарий отправляет 2 раза

 <script type="text/javascript">
function addcomment() {
$(function(){
    $('#addcomment').dialog({
                autoOpen: true,
                width: 745,
                height: 380,
                buttons: {
                        "Закрыть окно" : function() {
                                $(this).dialog("close");
                        },
                }
        });
});
}
</script>

<!-- Кнопка "Оставить комментарий" -->
            <div class="hidden-comment">
            <h3><a href="/addcomment" onclick="addcomment(); return false;">Оставить комментарий!</a></h3>
            </div>
<!-- Окно -->
            <div id="addcomment" title="Оставить комментарий" style="display:none; " >
            <div id="addcomment-form">
            {addcomments}
            </div>
            <br />
            </div>
<!-- //Окно// -->

<div class="add-comment">
    [not-logged]
    <div class="add-comment-line">
        <div class="add-comment-line-left">
            Ваше Имя:
        </div>
        <div class="add-comment-line-right">
            <input type="text" name="name" id="name" class="form-input-stand" />
        </div>
    </div>
    <div class="add-comment-line">
        <div class="add-comment-line-left">
            Ваш E-Mail:
        </div>
        <div class="add-comment-line-right">
            <input type="text" name="mail" id="mail" class="form-input-stand" />
        </div>
    </div>
    [/not-logged]
    <table>
        <tr>
            <td class="avatarcomm" valign="top">
                <img id="commentator_avatar" width="85" height="85" src="{THEME}/images/noavatar.png" alt=""/>
            </td>
            <td>{editor}</td>
        </tr>
    </table>
    [question]
            <div style="padding: 5px 0 5px 0;">
                Вопрос:
            </div>
            <div style="padding: 5px 0 5px 0;">
                {question}
            </div>
                
            <div style="padding: 5px 0 5px 0;">
                Ответ:<span class="impot">*</span>
            </div>
                
            <div style="padding: 5px 0 5px 0;">
                <input type="text" name="question_answer" id="question_answer" class="f_input" />
            </div>
    [/question]
    [sec_code]
    <div class="add-comment-line">
        <div class="add-comment-line-left">
            Код:
        </div>
        <div class="add-comment-line-right">
            {sec_code}
        </div>
    </div>
    <div class="add-comment-line">
        <div class="add-comment-line-left">
            Введите код:
        </div>
        <div class="add-comment-line-right">
            <input type="text" name="sec_code" id="sec_code" class="form-input-stand" />
        </div>
    </div>
    [/sec_code]
    
    [recaptcha]
    <div class="add-comment-line">
        Введите два слова, показанных на изображении: <span class="impot">*</span>
            <div>{recaptcha}</div>
    </div>
    [/recaptcha]
    <div class="add-comment-line">
        <input value="Добавить" name="submit" type="image" src="{THEME}/images/add-buttom.jpg" style="border: 0;" />
    </div>
</div>