JS图片横向滚动的代码

<!--//向左滚动代码开始-->
<style type="text/css">
body{margin:0px auto; padding:0px;}
ul,li{margin:0px; padding:0px;list-style:none;}
.sqBorder {width:602px; padding:10px; border:1px #000000 solid; background:#555555;}
.scroll_div {width:600px; margin:0 auto; overflow: hidden; white-space: nowrap; background:#ffffff;}
.scroll_div img {width:120px;border: 0;margin: auto 8px; border:1px #efefef solid;}
#scroll_begin, #scroll_end, #scroll_begin ul, #scroll_end ul, #scroll_begin ul li, #scroll_end ul li{display:inline;}/*设置ul和li横排*/
</style>
<script language="javascript">
function ScrollImgLeft(){
var speed=20
var scroll_begin = document.getElementById("scroll_begin");
var scroll_end = document.getElementById("scroll_end");
var scroll_div = document.getElementById("scroll_div");
scroll_end.innerHTML=scroll_begin.innerHTML
  function Marquee(){
    if(scroll_end.offsetWidth-scroll_div.scrollLeft<=0)
      scroll_div.scrollLeft-=scroll_begin.offsetWidth
    else
      scroll_div.scrollLeft++
  }
var MyMar=setInterval(Marquee,speed)
  scroll_div. {clearInterval(MyMar)}
  scroll_div. {MyMar=setInterval(Marquee,speed)}
}
</script>
<h2 align="center">向左滚动</h2>
<div style="text-align:center">
  <div class="sqBorder">
  <!--#####滚动区域#####-->
    <div id="scroll_div" class="scroll_div">
      <div id="scroll_begin">
        <ul>
          <li><a href="