Централизовать аватарку

<div class="binner">
    <table class="tableform">
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        <th class="imp"><label for="comments">Имя:</label></th>
        <td><input type="text" name="name" id="name" class="f_input" /></td>
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        <th class="imp"><label for="comments">E-Mail:</label></th>
        <td><input type="text" name="mail" id="mail" class="f_input" /></td>
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        <th><label for="comments"> <center><img id="commentator_avatar" src="{THEME}/images/noavatar.png" alt=""/> <br> [group=1,2,3,4,6,7,8]За спам в бан, ок <b>Гость</b>?[/group] </center> </label></th>
        <td class="editorcomm">{editor}</td>
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        <th class="imp"><label for="comments">Введите код:</label></th>
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          <div>{sec_code}</div>
          <div><input type="text" name="sec_code" id="sec_code" style="width:115px" class="f_input" /></div>
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      [recaptcha]
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        <th class="imp"><label for="comments">Введите два слова, показанных на изображении:</label></th>
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          <div>{recaptcha}</div>
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      </tr>
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        <th></th>
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        <button type="submit" name="submit" class="fbutton"><span>[not-aviable=comments]Добавить[/not-aviable][aviable=comments]Изменить[/aviable]</span></button></td>
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