不间断向上滚动的文字

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<style type="text/css">
<!--
body {
margin-left: 0px;
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</style><div id=demo style=overflow:hidden;height:20;width: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>
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<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(){
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demo.scrollTop++
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var MyMar=setInterval(Marquee,speed)
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demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
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