JavaScript实现图片左右无缝滚动效果

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片滚动</title>
</head>
<body>
<style type="text/css">
<!--
#picScroll {background: #FFF;overflow:hidden;border: 1px dashed #CCC;width: 745px;}
#picScroll img {border: 3px solid #F2F2F2;}
#picSdiv {float: left;width: 800%;}
#picSdiv1 {float: left;}
#picSdiv2 {float: left;}
-->
</style>
<div id="picScroll">
  <div id="picSdiv">
    <div id="picSdiv1">
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a1.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a2.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a3.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a4.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a5.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a6.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a7.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a8.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a9.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a10.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a11.jpg" border="0" width="185" height="240" /></a>
      <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><img src="./img/a12.jpg" border="0" width="185" height="240" /></a>
    </div>
    <div id="picSdiv2"></div>
  </div>
</div>
<script>
<!--
var speed=10;
var picS=document.getElementById("picScroll");
var picS1=document.getElementById("picSdiv1");
function Marquee(){
  if(picS.scrollLeft >= picS1.offsetWidth)
    picS.scrollLeft =0;
  else{
    picS.scrollLeft++;
  }
}
var MyMar=setInterval(Marquee,speed);
picS.onmouseover=function() {clearInterval(MyMar)};
picS.onmouseout=function() {MyMar=setInterval(Marquee,speed)};
-->
</script>
</body>
</html>