<div id="demo" οnmοuseοver="clearInterval(timer)" οnmοuseοut="timer=setInterval(mar,30)" style="overflow:hidden; height:186px; width:180px;">

<div id="demo1">

     000FDF0SD0FS0DF0

</div>

<div id="demo2"></div>

</div>

<script> 

var t=getid("demo"),t1=getid("demo1"),t2=getid("demo2"),sh=getid("show"),timer;

t2.innerHTML=t1.innerHTML;

function mar(){

if(t2.offsetTop<=t.scrollTop)

t.scrollTop-=t1.offsetHeight;

else

t.scrollTop++;

}

timer=setInterval(mar,30);

function getid(id){

return document.getElementById(id);

}

</script>