    <h4 style="background:#f0f0f0;margin: 0 -15px 15px -15px;font-size:16px; padding:10px;">邮件文件夹</h4>
    <ul class="mailbox_list">
      <li>
        <a href="<?php echo site_url('mail/index'); ?>">
          <span class="glyphicon glyphicon-folder-open"></span> 收件箱 <span id="new_mail_count" data-num="<?php echo $unseen_num; ?>"><?php echo $unseen_num!=0?'('.$unseen_num.')':''; ?></span>
        </a>
        <ul>
          <li></li>
        </ul>
      </li>
      <li><a href="<?php echo site_url('mail/index/sent'); ?>"><span class="glyphicon glyphicon-folder-close"></span> 发件箱</a></li>
      <li><a href="<?php echo site_url('mail/index/deleted'); ?>"><span class="glyphicon glyphicon-folder-close"></span> 垃圾箱</a></li>
    </ul>
  