调用SQL”连续滚动文章”标签，为什么只能滚动一次，如何才能连续多次滚动？

查询语句：select TOP 20 id,Title from KS_Article where Tid="20108976052328" or Tid="20105576812086" or Tid="20106396358701" or Tid="20100287353286" order by id desc

循环体：

<DIV id=demo onmouseover=ii=1 style="OVERFLOW: hidden; HEIGHT: 260px" onmouseout=ii=0>
<DIV id=demo1>
<table width="100%" border="0" cellspacing="0" cellpadding="3">

[loop=20]
<tr>
<td>&nbsp;&nbsp;<a href="{$Field(ID,GetInfoUrl,1,1)}">{$Field(Title,Text,0,,0,)}</a></td>
</tr>
[/loop]

</table>

</DIV>
<DIV id=demo2>
<SCRIPT>
var ii=0;t=demo.scrollTop
demo2.innerHTML=demo1.innerHTML
function qswhMarquee(){
if (ii==1)return
if(demo2.offsetTop-demo.scrollTop<=0)
demo.scrollTop-=demo1.offsetHeight
else
demo.scrollTop++
}
setInterval(qswhMarquee,60)
</SCRIPT></DIV>

谢谢