不间断向上滚动的文字

<link href="text.css" rel="stylesheet" type="text/css">
<style type="text/css">
<!--
body {
margin-left: 0px;
margin-top: 0px;
}
-->
</style><div id=demo style=overflow:hidden;height:20;156;color:#ffffff>
<table width="156" height="20" border=0 align=left cellpadding=0 cellspace=0>
<tr>
<td id=demo1 valign=top> <table width="160" height="20" border=0 cellpadding=0 cellspacing=0>
<tr>
<td valign="top">
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<table width="161" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td width="161"> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<table width="156" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<table width="156" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<table width="156" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<table width="156" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<table width="156" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<table width="156" border="0" cellpadding="0" cellspacing="0" class="text">
<tr>
<td> <div align="center">
<p class="text13"><font color="#000000">山城重庆的风景名胜 榕树</font></p>
</div></td>
</tr>
</table>
<!--juyjhyjyj-->
</td>
</tr>
</table></td>
<tr>
<td id=demo2 valign=top></td>
</tr>
</table>
</div>
<script>
var speed=80
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetTop-demo.scrollTop<=0)
demo.scrollTop-=demo1.offsetHeight
else{
demo.scrollTop++
}
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
</script>