帝国cms灵动标签循环输出不同样式问题

请问帝国cms灵动标签怎么才能输出这种列表呢就想让他每3个换个样式！
<div  class="mTBox1_1"></div>
<div  class="mTBox1_1"></div>
<div  class="mTBox1_1"></div>
<div  class="mTBox1_2"></div>
<div  class="mTBox1_2"></div>
<div  class="mTBox1_2"></div>
<div  class="mTBox1_1"></div>
<div  class="mTBox1_1"></div>
<div  class="mTBox1_1"></div>
<div  class="mTBox1_2"></div>
<div  class="mTBox1_2"></div>
<div  class="mTBox1_2"></div>
[e:loop={1,6,1,1}]
    <?php
    $class=(($bqno-1)%6<3)?"mTBox1_1":"mTBox1_2";
    ?>
    <li class='<?=$class?>'> <a href="<?=$bqsr['titleurl']?>" target="_blank"><?=$bqr['title']?></a></li>
[/e:loop]