su怎么向上移动|文字向上移动

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<script language="javascript">
marqueesHeight=100;
stopscroll=false;
with(document.getElementById("marquees")){
 style.width=0;
 style.height=marqueesHeight;
 style.overflowX="visible";
 style.overflowY="hidden";
 noWrap=true;
 onmouseover=new Function("stopscroll=true");
 onmouseout=new Function("stopscroll=false");
}
document.write("");

preTop=0; currentTop=0;

function init(){
document.getElementById("templayer").innerHTML="";
while(document.getElementById("templayer").offsetHeight document.getElementById("templayer").innerHTML+=document.getElementById("marquees").innerHTML;
}
document.getElementById("marquees").innerHTML=document.getElementById("templayer").innerHTML+document.getElementById("templayer").innerHTML;
setInterval("scrollUp()",30);
}
document.body.onload=init;

function scrollUp(){
if(stopscroll==true) return;
preTop=document.getElementById("marquees").scrollTop;
document.getElementById("marquees").scrollTop+=1;
if(preTop==document.getElementById("marquees").scrollTop){
document.getElementById("marquees").scrollTop=document.getElementById("templayer").offsetHeight-marqueesHeight;
document.getElementById("marquees").scrollTop+=1;
}
}
</script>

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