分类信息中的DIY模板，怎么获取帖子头像和用户名，代码如下，红色部分为头像和用户名，要怎么修改，麻烦大神帮个忙


<li>
<div class="deancasepics">
<a href="{subject_url}" target="_blank">
<img src="{fm_value}" />
<p>{subject}</p>
</a>
</div>
<div class="deancasebottom">
<div class="deancase_sj">
<div class="deansjstx" style=" background:url(uc_server/avatar.php?uid=$post[authorid]&size=middle) center no-repeat; background-size: 88px 46px;"></div>
<em>{$post[author]}</em>
<div class="clear"></div>
</div>
<div class="deancaseinfos">
<dl>
<dd>{thd_name}：{thd_name_value}</dd>
<dd>{thd_size}：{thd_size_value}</dd>
<dd>{thd_type}：{thd_type_value}㎡</dd>
<dd>{thd_pswd}：{thd_pswd_value}万</dd>
<div class="clear"></div>
</dl>
</div>
<div class="clear"></div>
</div>
</li>