动态图片javascript

<div class="titleBarBot" id="demo">
<div id="indemo">
<div id="demo1">
<a href="http://yqgl.hx2000.com.cn/home/City/detial_yqzs.asp?acode=3204&amp;id=63"
target="_blank">
<img height="90" alt="艾默生推出410VP模型的四电极传感器" src="HX2000教育装备与实验教学管理系统 - 常州市.files/200881101819703.jpg"
width="120" border="0" /></a> <a href="http://yqgl.hx2000.com.cn/home/City/detial_yqzs.asp?acode=3204&amp;id=62"
target="_blank">
<img height="90" alt="施克公司推出新型WF Next叉形传感器" src="HX2000教育装备与实验教学管理系统 - 常州市.files/200881101547687.jpg"
width="120" border="0" /></a> <a href="http://yqgl.hx2000.com.cn/home/City/detial_yqzs.asp?acode=3204&amp;id=61"
target="_blank">
<img height="90" alt="赛科国产高清晰投影机的魅力" src="HX2000教育装备与实验教学管理系统 - 常州市.files/200881101535671.jpg"
width="120" border="0" /></a>
</div>
<div id="demo2">
</div>
</div>
<script type="text/javascript">
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var speed=30; //数字越大速度越慢
var tab=document.getElementById("demo");
var tab1=document.getElementById("demo1");
var tab2=document.getElementById("demo2");
tab2.innerHTML=tab1.innerHTML;
function Marquee(){
if(tab2.offsetWidth-tab.scrollLeft<=0)
tab.scrollLeft-=tab1.offsetWidth
else{
tab.scrollLeft++;
}
}
var MyMar=setInterval(Marquee,speed);
tab.onmouseover=function() {clearInterval(MyMar)};
tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};
-->
</script>
</div>

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