救急!!怎样在循环里面使用层?

<td alt="<%=rs("Info")%>" onmousemove="show(this)" onmouseout="hide()">---------------------------------------
<style>
#div1{position:absolute;border:1 solid #3366cc;background-color:#d2e8ff;color:blue;width:100;font-size:12px}
</style>
</head>
<body>
<script>
function document.onmousemove(){
if(event.srcElement.tagName=="TD"){
var v=document.getElementById("div1")
v.style.visibility=''
v.innerHTML=event.srcElement.alt
v.style.pixelLeft=event.clientX+document.body.scrollLeft+10;
v.style.pixelTop=event.clientY+document.body.scrollTop+10
}
}
function document.onmouseout(){
if(event.srcElement.tagName=="TD"){
var v=document.getElementById("div1")
v.style.visibility='hidden'
}
}
</script><div id=div1 style="visibility:hidden"></div>