为什么图片不滚动

//-----------css.img_cro{ width:1021px; height:192px; background:url(../images/img_cro.jpg) repeat-y; overflow:hidden;}
.img_1{ display:inline; float:left; margin-top:7px; margin-left:35px; width:210px; height:185px; text-align:center; line-height:22px;}
.img_1 a{ font-family:"微软雅黑"; font-size:14px; color:#0051bf;}
.img_1 a:hover{ text-decoration:underline;}
.img_1 img{ display:inline; float:left; border:5px #FFF solid;}//-----------js<script type="text/javascript">
$(document).ready(function(){// $('#image_list').kxbdMarquee({ loop: 0, direction: 'left'});
//
$("#image_list").simplyScroll({
autoMode: 'loop',
frameRate: 50,
speed: 1
});
});
 </script>//----------html页<div id="image_list" class="img_cro">
 <ul style="width:800px">
  {loop $arrpic $rowpic}
   <div class="img_1">
    <li style="width:200px; display:block; float:left;">
     <a href="goinzhidao.php">
      <img src="{eval echo $rowpic['photo'];}" />{eval echo $rowpic['name'];}
     </a>
    </li>
   </div>
  {/loop}
 </ul>
</div>