<div id=demo style=overflow:hidden;height:520;width:180;>
         <div id=demo1>
         <span jwcid="commodityNewestListLoop">
                                      <table width="100%" border="0" cellspacing="0" cellpadding="0">
                                        <tr>
                                          <td height="130" align="center"><table width="120" border="0" cellspacing="0" cellpadding="0">
                                              <tr>
                                                <td height="120" align="center"><a href="#" target="_blank" jwcid="commodityNewestContentLink2"><img src="images/baijia/tu/8.jpg" width="120" height="120" border="0" jwcid="commodityNewestLogo"/></a></td>
                                              </tr>
                                          </table></td>
                                        </tr>
                                        <tr>
                                          <td><table width="100%" border="0" cellspacing="1" cellpadding="2">
                                              <tr>
                                                <td align="center" bgcolor="#000000"><a href="bjgw1.html" class="bj5" jwcid="commodityNewestContentLink" target="_blank"><span jwcid="@Insert" value="ognl:@com.ir.core.util.StringHandler@cutShortStr(commodityItem.model, 28)">SONY800万像素超值相机组</span></a></td>
                                              </tr>
                                              <tr>
                                                <td align="center" bgcolor="#FFCC01">市价:<span jwcid="@If" condition="ognl:commodityItem.marketPrice==0">－－</span><span jwcid="@Else">￥<span jwcid="@Insert" value="ognl:commodityItem.marketPrice">100</span>元</span>&nbsp;<span class="bjgw_19">特价:<span jwcid="@Insert" value="ognl:commodityItem.promotionPrice">100</span>元</span></td>
                                              </tr>
                                          </table></td>
                                        </tr>
                                        <tr>
                                          <td height="1" bgcolor="#41413F"></td>
                                        </tr>
                                      </table>
                                    </span>
         </div>
           <div id=demo2></div>
           </div>

<script language="javascript">
<!--//
var speed=30
demo2.innerHTML=demo1.innerHTML //克隆demo1为demo2
function Marquee(){
 //当滚动至demo1与demo2交界时
 if(demo2.offsetTop-demo.scrollTop<=0)  
  demo.scrollTop-=demo1.offsetHeight //demo跳到最顶端
 else{
  demo.scrollTop++
 }
}
var MyMar=setInterval(Marquee,speed)//设置定时器
//鼠标移上时清除定时器达到滚动停止的目的
demo.onmouseover=function() {clearInterval(MyMar)}
//鼠标移开时重设定时器
demo.onmouseout=function(){MyMar=setInterval(Marquee,speed)}

window.onload = function() {
 //inputIframeCenter1();
 var userLoginIframe = document.getElementById("userLoginIframe");
 userLoginIframe.contentWindow.remove_loading();
}
//-->
</script>

红色为必须的JS代码；

蓝色为循环T代码；

黑色随便可以替换。