这个程序那里出错?
<script language="JavaScript">
//var msg='22222222222222222222 '
function scroll(msg,interval,seq)
{
len=msg.length;
//alert(len);
document.all.aa.innerHTML=msg.substring(0,seq+1);
seq++;
if (seq>=len)
{
seq=0;
document.all.aa.innerHTML='';
window.setTimeout('scroll();',interval);
}
else
window.setTimeout('scroll();',interval);
}
//scroll('222222222222222','200','0');
</script>
<body>
<div id="aa"><script language="JavaScript">scroll('2222222222222222','200','0');</script></div>
</body>
请高手指正!