js实现不间断滚动图片的代码

<div class="demo" id="demo1">
  <table cellpadding="0" cellspacing="0">
    <tr>
      <td><ul>
          <li><img src="img.jpg"><br>
            滚动图1</li>
          <li><img src="img.jpg"><br>
            滚动图2</li>
          <li><img src="img.jpg"><br>
            滚动图3</li>
          <li><img src="img.jpg"><br>
            滚动图4</li>
        </ul></td>
    </tr>
  </table>
</div>
<!--第二个滚动图开始-->
<div class="demo" id="demo2">
  <table cellpadding="0" cellspacing="0">
    <tr>
      <td><ul>
          <li><img src="img.jpg"><br>
            滚动图1</li>
          <li><img src="img.jpg"><br>
            滚动图2</li>
          <li><img src="img.jpg"><br>
            滚动图3</li>
          <li><img src="img.jpg"><br>
            滚动图4</li>
        </ul></td>
    </tr>
  </table>
</div>

ul,li,img,td{font-size:12px;list-style-type:none;text-align:center;margin:0;padding:0;}
.demo{width:230px;margin-bottom:8px;height:172px;overflow:hidden;}
.demo ul{width:408px;clear:both;}
.demo li{width:102px;float:left;text-align:center;}
.demo img{margin-bottom:8px;}

function startmarquee(lh,speed,delay,index){
        var o=document.getElementById("demo"+index);
        var o_td=o.getElementsByTagName("td")[0];
        var str=o_td.innerHTML;
        var newtd=document.createElement("td");
            newtd.innerHTML=str;
            o_td.parentNode.appendChild(newtd);
        var t;
        var p=false;
      o.onmouseover=function(){p=true;}
      o.onmouseout=function() {p=false;}
      function start(){
        t=setInterval(Marquee,speed);
        if(!p){o.scrollLeft += 3;}
      }
      function Marquee(){
          if(o_td.offsetWidth-o.scrollLeft<=0)
          o.scrollLeft-=o_td.offsetWidth;
          else{
            if(o.scrollLeft%lh!=0){
                o.scrollLeft+= 3
                }else{clearInterval(t); setTimeout(start,delay);}
          }
      }
      setTimeout(start,delay);
}
startmarquee(102,1,1500,1);//图片间停式滚动
startmarquee(102,30,1,2);//图片不间断滚动