请问如何把下面这两个图片调用成别的图片内容

{volist name="listdb" id="rs"}
     <li>
             <div class="bigimg">
                 <a href="{$rs.url}" target="_blank">
    <div class="photo"><img src="{$rs.picurl}" onerror="this.src='/asset/images/default_photo.png'"></div>
    <p>{$rs.title}</p>
</a>
             </div>
             <div class="smallimg clearfix">
                 <div class="pic"><a href="{$rs.url}" target="_blank">
    <div class="photo"><img src="{$rs.picurl}" onerror="this.src='/asset/images/default_photo.png'"></div>
    <p>{$rs.title}</p>
</a>
</div><div class="pic"><a href="{$rs.url}" target="_blank">
    <div class="photo"><img src="{$rs.picurl}" onerror="this.src='/asset/images/default_photo.png'"></div>
    <p>{$rs.title}</p>
</a>
</div>            </div>
         </li>    
     {/volist}
         {/qb:tag}