<body>
<script>
var x=20;y=30; //層初始位置
var i=0,j=0; //判斷方向變數
function floatAD()
{
var obj=document.getElementById("ad2");
var R = document.body.offsetWidth-obj.offsetWidth-24; //頁面寬度－層寬度－右捲軸寬度
var B = document.body.offsetHeight-obj.offsetHeight; //頁面高度－層寬度
obj.style.left = x + document.body.scrollLeft; //層距左距離+滾動後的左距離
obj.style.top = y + document.body.scrollTop; //層距頂距離+滾動後的頂距離
if(i==0){
x++;if(x==R){i=1;}
}
else{
x--;if(x==0){i=0;}
}
if(j==0){
y++;if(y==B){j=1;}
}
else{
y--;if(y==0){j=0;}
}
setTimeout("floatAD()", 10)
}
window.onload=floatAD;
</script>
<div id="ad2" style="position:absolute; width:200px; height:148px; left: 20px; top: 30px; z-index:3"><a href="sy/" target="_blank">
<img src="2.gif" width="200" height="148" /></a></div>
</body>
</html>
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