<div id="ad" style="position:absolute">
<a href=http://hr.shyyw.com target="_blank">
<img src="http://hr.shyyw.com/index/img/logo.jpg" border="0">
</a></div>
<script>
var x = 50,y = 60
var xin = true, yin = true
var step = 1
var delay = 10
var obj=document.getElementById("ad")
function floatAD() {
var L=T=0
var R= document.body.clientWidth-obj.offsetWidth
var B = document.body.clientHeight-obj.offsetHeight
obj.style.left = x + document.body.scrollLeft
obj.style.top = y + document.body.scrollTop
x = x + step*(xin?1:-1)
if (x < L) { xin = true; x = L}
if (x > R){ xin = false; x = R}
y = y + step*(yin?1:-1)
if (y < T) { yin = true; y = T }
if (y > B) { yin = false; y = B }
}
var itl= setInterval("floatAD()", delay)
obj.onmouseover=function(){clearInterval(itl)}
obj.onmouseout=function(){itl=setInterval("floatAD()", delay)}
</script>
[Ctrl+A 全选 提示：你可先修改部分代码，再按运行]
代码分析： <div id="ad" style="position:absolute">
<a href="http://www.119sky.com
" target="_blank">
<img src="http://www.119sky.com/web/images/logo.gif
" border="0">
</a></div>
<script>
var x = 50,y = 60 //浮动层的初始位置，分别对应层的初始X坐标和Y坐标
var xin = true, yin = true //判断层的X坐标和Y坐标是否在在控制范围之内，xin为真是层向右移动，否则向左；yin为真是层向下移动，否则向上
var step = 1 //层移动的步长，值越大移动速度越快
var delay = 10 //层移动的时间间隔,单位为毫秒，值越小移动速度越快
var obj=document.getElementById("ad") //捕获id为ad的层作为漂浮目标
function floatAD() {
var L=T=0 //层移动范围的左边界(L)和上边界(T)坐标
var R= document.body.clientWidth-obj.offsetWidth //层移动的右边界
var B = document.body.clientHeight-obj.offsetHeight //层移动的下边界
obj.style.le
