求javasCript图片无缝滚动代码！

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>无标题页</title>
</head>
<body> <DIV 
      style="BACKGROUND: none transparent scroll repeat 0% 0%; OVERFLOW: hidden; WIDTH: 1000px; POSITION: relative; HEIGHT: 150px"><!--**********************************************************奖品滚动图片************************************-->      <DIV 
      style="MARGIN-TOP: 20px; MARGIN-LEFT: 350px; WIDTH: 400px; POSITION: relative; HEIGHT: 110px"><IMG 
      onmouseover="moveThis('left')" 
      style="LEFT: 0px; CURSOR: pointer; BOTTOM: 30px; POSITION: absolute" 
      onmouseout=moveout() 
      src="http://r.6.cn/imges/events/lenovo2/index_arrow_left.jpg"> 
      <DIV id=demo 
      style="LEFT: 45px; OVERFLOW: hidden; WIDTH: 310px; POSITION: absolute; TOP: 5px; HEIGHT: 125px">
      <TABLE cellSpacing=0 cellPadding=0 border=0>
        <TBODY>
        <TR>
          <TD id=demo1>
            <TABLE id=demo3 style="MARGIN-LEFT: 0px" cellSpacing=0 cellPadding=0 
            width=700 border=0>
              <TBODY>
              <TR>                <TD align=middle width=140><A 
                  href="http://zhengji.6.cn/prize.html" target=_blank><IMG 
                  src="http://r.6.cn/imges/events/lenovo2/award1.jpg" 
                border=0></A><br />11111111</TD>
                <TD align=middle width=140><A 
                  href="http://zhengji.6.cn/prize.html" target=_blank><IMG 
                  src="http://r.6.cn/imges/events/lenovo2/award2.jpg" 
                border=0></A><br />2222222</TD>
                <TD align=middle width=140><A 
                  href="http://zhengji.6.cn/prize.html" target=_blank><IMG 
                  src="http://r.6.cn/imges/events/lenovo2/award3.jpg" 
                border=0></A><br />3333333</TD>
                <TD align=middle width=140><A 
                  href="http://zhengji.6.cn/prize.html" target=_blank><IMG 
                  src="http://r.6.cn/imges/events/lenovo2/award4.jpg" 
                border=0></A><br />44444</TD>
                <TD align=middle width=140><A 
                  href="http://zhengji.6.cn/prize.html" target=_blank><IMG 
                  src="http://r.6.cn/imges/events/lenovo2/award5.jpg" 
                border=0></A><br />5555</TD></TR></TBODY></TABLE></TD>
          <TD id=demo2></TD></TR></TBODY></TABLE></DIV><IMG 
      onmouseover="moveThis('right')" 
      style="RIGHT: 0px; CURSOR: pointer; BOTTOM: 30px; POSITION: absolute" 
      onmouseout=moveout() 
      src="http://r.6.cn/imges/events/lenovo2/index_arrow_right.jpg"> </DIV><!--**********************************************************奖品滚动图片 end************************************--></DIV>
      <script type="text/javascript">
      
      //滚动图片js函数
function $(v){return document.getElementById(v);}
 
var speed=30;
var demo2=$("demo2");
var demo=$("demo");
var demo1=$("demo1");
demo2.innerHTML=demo1.innerHTML;
function MarqueeL(){
if(demo2.offsetWidth-demo.scrollLeft<=0)
demo.scrollLeft-=demo1.offsetWidth;
else
demo.scrollLeft++;
}
function MarqueeR(){
if(demo2.offsetWidth-demo.scrollLeft>=310)
demo.scrollLeft+=demo1.offsetWidth;
else
demo.scrollLeft--;
}
var flag=0;
var MyMar;
//var MyMar=setInterval(MarqueeL,speed);
demo.onmouseover=function() {if(MyMar){clearInterval(MyMar)}}
//demo.onmouseout=function() {MyMar=setInterval(MarqueeR,speed)}
function moveout(way)
{
if(MyMar)
{
clearInterval(MyMar);
}
}
function moveThis(way){ 
if(way=='right'){ 
flag=1;
if(MyMar)
{
clearInterval(MyMar);
}
MyMar=setInterval(MarqueeR,speed);
}
else{ 
flag=0;
if(MyMar)
{
clearInterval(MyMar);
}
MyMar=setInterval(MarqueeL,speed);
}
if(flag) demo.onmouseout=function() {MyMar=setInterval(MarqueeR,speed)}
else demo.onmouseout=function() {MyMar=setInterval(MarqueeL,speed)}
}  
      
      </script></body>
</html>