网页特效”漂浮广告代码”来回跳动的

<div id="ad" style="position:absolute">
<a href="http://www.cnblog.com/wayne173" target="_blank">
<img src="http://static.cnblogs.com/images/adminlogo.gif" border="0">
</a></div>
<script type="text/javascript">
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 + "px";
obj.style.top = y + document.body.scrollTop + "px";
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);}
&lt;/script&gt;
&lt;SCRIPT LANGUAGE="JavaScript"&gt;
var s = "网页可见区域宽 ："+ document.body.clientWidth;
s += " 网页可见区域高："+ document.body.clientHeight;
s += " 网页可见区域高："+ document.body.offsetHeight +" (包括边线的宽)";
s += " 网页正文全文宽："+ document.body.scrollWidth;
s += " 网页正文全文高："+ document.body.scrollHeight;
s += " 网页被卷去的高："+ document.body.scrollTop;
s += " 网页被卷去的左："+ document.body.scrollLeft;
s += " 网页正文部分上："+ window.screenTop;
s += " 网页正文部分左："+ window.screenLeft;
s += " 屏幕分辨率的高："+ window.screen.height;
s += " 屏幕分辨率的宽："+ window.screen.width;
s += " 屏幕可用工作区高度："+ window.screen.availHeight;
s += " 屏幕可用工作区宽度："+ window.screen.availWidth;
document.write(s);
&lt;/script&gt;

http://www.cnblog.com/wayne173 //换成是漂浮图片点击后出现的页面，也就是点击后出现的详细的介绍页面

http://static.cnblogs.com/images/adminlogo.gif //换成是漂浮广告图片的URL地址，最好采用绝对路径
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