JS图片无缝运动

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" type="text/css" href="系统CSS初始化.css">
    <style>
        #l{
            width: 220px;
            height: 200px;
            position: relative;
            bottom: 350px;
            left: 50px;
        }
        #r{
            width: 220px;
            height: 200px;
            position: relative;
            bottom: 350px;
            left: 850px;
        }
        #div1{
            position: relative;
            width: 800px;
            height: 220px;
            margin: 150px auto;
            background: red;
            overflow: hidden;

        }
        #div1 ul{
            width: 1600px;
            height: 220px;
            background: rebeccapurple;
            position: absolute;
            left: 0;
        }
        #div1 ul img{
            width: 200px;
            height: 220px;
            float: left;
        }
    </style>
    <script>
        window.onload=function ()
        {
            var oDiv1=document.getElementById("div1");
            var oUl=document.getElementById("ul1");
            var oImg=oDiv1.getElementsByTagName("img");
            oUl.innerHTML=oUl.innerHTML+oUl.innerHTML;
           var oL=document.getElementById("l");
           var oR=document.getElementById("r");
           var speed=0;
           oL.onmousemove=function ( ){
               speed=-10;
           }
           oR.onmousemove=function () {
               speed=10;
           }
            setInterval(function () {
                if(oUl.offsetLeft<-800)
                {
                    oUl.style.left=0;
                }
                if(oUl.offsetLeft>0)
                {
                    oUl.style.left=-800+'px';
                }
                oUl.style.left=oUl.offsetLeft+speed+'px';
            },30)

        }

    </script>
</head>
<body>
<div id="div1">

    <ul id="ul1">
        <img src="images/A.jpg">
        <img src="images/B.jpg">
        <img src="images/C.jpg">
        <img src="images/D.jpg">
    </ul>

</div>
<img src="images/l.png"  id="l">
<img src="images/r.png"  id="r">
</body>
</html>
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