<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<script>
var x=20;y=30; //层初始位置
var i=0,j=0; //判断方向变量
function floatAD()
{
var obj=document.getElementById("ad2");
var R = document.body.offsetWidth-obj.offsetWidth-24; //页面宽度－层宽度－右滚动条宽度
var B = document.body.offsetHeight-obj.offsetHeight; //页面高度－层宽度
obj.style.left = x + document.body.scrollLeft; //层距左距离+滚动后的左距离
obj.style.top = y + document.body.scrollTop; //层距顶距离+滚动后的顶距离
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; 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>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
</head>
<body>
<script>
var x=20;y=30; //层初始位置
var i=0,j=0; //判断方向变量
function floatAD()
{
var obj=document.getElementById("ad2");
var R = document.body.offsetWidth-obj.offsetWidth-24; //页面宽度－层宽度－右滚动条宽度
var B = document.body.offsetHeight-obj.offsetHeight; //页面高度－层宽度
obj.style.left = x + document.body.scrollLeft; //层距左距离+滚动后的左距离
obj.style.top = y + document.body.scrollTop; //层距顶距离+滚动后的顶距离
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; 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>