js实现文字无间断上下滚动

<!doctype html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="keywords" content="关键字1,关键字2" />
<meta name="Description" content="描述信息" />
<title>循环滚动</title>
<!--CSS/JS-->
<style type="text/css">
*{margin:0;padding:0;}
ul,li{list-style:none;display:block;}
#scrollBox{height:150px;300px;margin:100px auto;background:#f09;overflow:hidden;}
#scrollBox #con1,#con2{280px;float:left;}
#scrollBox li{height:15px;line-height:15px;text-align:center;}

</style>

</head>
<body>
<!--div-->
<div >
var area =document.getElementById('scrollBox');
var con1 = document.getElementById('con1');
var con2 = document.getElementById('con2');
con2.innerHTML=con1.innerHTML;
function scrollUp(){
if(area.scrollTop>=con1.offsetHeight){
area.scrollTop=0;
}else{
area.scrollTop++
}
}
var time = 50;
var mytimer=setInterval(scrollUp,time);
area.onmouseover=function(){
clearInterval(mytimer);
}
area.onmouseout=function(){
mytimer=setInterval(scrollUp,time);
}
</script>
</body>

</html>