<!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>文字上下无间断滚动</title>
</head>
<body>
<div id="demo" onmouseover="clearInterval(timer)" onmouseout="timer=setInterval(mar,30)" style="overflow:hidden; height:60px; width:100px;">
<div id="demo1">
第一行<br>
第二行<br>
第三行<br>
第四行<br>
第五行<br>
第六行
</div>
<div id="demo2"></div>
</div>
<script>
var t=getid("demo"),t1=getid("demo1"),t2=getid("demo2"),sh=getid("show"),timer;
t2.innerHTML=t1.innerHTML;
function mar(){
if(t2.offsetTop<=t.scrollTop)
t.scrollTop-=t1.offsetHeight;
else
t.scrollTop++;
}
timer=setInterval(mar,30);
function getid(id){
return document.getElementById(id);
}
</script>
</body>
</html>

http://www.corange.cn/archives/2008/11/2145.html