JavaScript 实现图片无缝滚动效果

<!doctype html>
<title>javascript无缝滚动</title>
<meta charset="utf-8" />
<meta name="keywords" content="javascript无缝滚动" />
<meta name="description" content="javascript无缝滚动" />
<style type="text/css">
  h1 {
    font: 400 16px/1 "Microsoft YaHei", KaiTi_GB2312, SimSun
  }
  #marquee {
    position: relative;
    width: 400px;
    overflow: hidden;
    border: 10px solid #8080C0;
  }
  #marquee img {
    border: 0px;
  }
  #marquee dl,
  #marquee dt,
  #marquee dd,
  #marquee a {
    float: left;
    margin: 0;
    padding: 0;
  }
  #marquee dl {
    width: 1000%;
    height: 150px;
  }
</style>
<script type="text/javascript">
var Marquee = function(id) {
  try {
    document.execCommand("BackgroundImageCache", false, true);
  } catch(e) {};
  var container = document.getElementById(id),
    original = container.getElementsByTagName("dt")[0],
    clone = container.getElementsByTagName("dd")[0],
    speed = arguments[1] || 10;
  clone.innerHTML = original.innerHTML;
  container.scrollLeft = clone.offsetLeft
  var rolling = function() {
    if(container.scrollLeft == 0) {
      container.scrollLeft = clone.offsetLeft;
    } else {
      container.scrollLeft--;
    }
  }
  var timer = setInterval(rolling, speed) //设置定时器
  container.onmouseover = function() {
      clearInterval(timer)
  } //鼠标移到marquee上时，清除定时器，停止滚动
  container.onmouseout = function() {
      timer = setInterval(rolling, speed)
  } //鼠标移开时重设定时器
}
window.onload = function() {
  Marquee("marquee");
}
</script>
<h1>javascript无缝滚动(向右滚动)</h1>
<div id="marquee">
  <dl>
    <dt>
      <a href="###"><img src="img/o_s017.jpg" alt="javascript无缝滚动"/></a>
      <a href="###"><img src="img/o_s018.jpg" alt="javascript无缝滚动"/></a>
      <a href="###"><img src="img/o_s019.jpg" alt="javascript无缝滚动"/></a>
      <a href="###"><img src="img/o_s020.jpg" alt="javascript无缝滚动"/></a>
      <a href="###"><img src="img/o_s021.jpg" alt="javascript无缝滚动"/></a>
      <a href="###"><img src="img/o_s022.jpg" alt="javascript无缝滚动"/></a>
      <a href="###"><img src="img/o_s023.jpg" alt="javascript无缝滚动"/></a>
    </dt>
    <dd></dd>
  </dl>
</div>