滚动栏

不会出现滚动完就空白的滚动栏
1、demob的高度一定要小于demob1的高度
2、一个滚动栏的高度大概在20px左右
<div id="demob" onmouseover="ij=1" style="OVERFLOW: hidden; HEIGHT: 1000px; width:211px " onmouseout="ij=0">
<div id="demob1">
<a href=''>123</a><br>
<a href=''>456</a><br>
<a href=''>789</a><br>
<a href=''>888</a><br>
<a href=''>aaa</a><br>
<a href=''>bbb</a><br>
<a href=''>ccc</a><br>
<a href=''>eee</a><br>
</div>
<div id="demob2"></div>
</div>
<SCRIPT>
var ij=0;t=demob.scrollTop
demob2.innerHTML=demob1.innerHTML
function qswhMarquee2()
{
if (ij==1)return
if(demob2.offsetTop-demob.scrollTop<=0)
demob.scrollTop-=demob1.offsetHeight
else
demob.scrollTop++
}
setInterval(qswhMarquee2,50)
</SCRIPT>