我有 但是是左右2边的 你直接复制 然后放在JS文件里 lastScrollY = 0function heartBeat(){ var diffYif (document.documentElement &&document.documentElement.scrollTop) diffY = document.documentElement.scrollTopelse if (document.body) diffY = document.body.scrollTop else {/*Netscape stuff*/} //alert(diffY)percent=.1*(diffY-lastScrollY)if(percent>0)percent=Math.ceil(percent)else percent=Math.floor(percent)document.getElementById("leftDiv").style.top = parseInt(document.getElementById("leftDiv").style.top)+percent+"px"document.getElementById("rightDiv").style.top = parseInt(document.getElementById("rightDiv").style.top)+percent+"px"lastScrollY=lastScrollY+percent//alert(lastScrollY)} //下面这段删除后，对联将不跟随屏幕而移动。 window.setInterval("heartBeat()",1)//-->//关闭按钮 function close_left1(){ // left1.style.visibility='hidden'left1.style.display='none'leftDiv.style.display='none'} function close_right1(){ //right1.style.visibility='hidden'right1.style.display='none'rightDiv.style.display='none'} //显示样式 document.writeln("<style type=\"text\/css\">")document.writeln("#leftDiv,#rightDiv{width:100pxheight:100pxbackground-color:#fffposition:absolute}")document.writeln(".itemFloat{width:100pxheight:autoline-height:5px}")document.writeln("<\/style>")//以下为主要内容 document.writeln("<div id=\"leftDiv\" style=\"top:40pxleft:5px\">")//------左侧各块开始 //---L1 document.writeln("<div id=\"left1\" class=\"itemFloat\">")document.writeln("<a href='freecalls_business.aspx'><img src=images\\index_ad_3_min.jpg width=100 height=300 /></a>")document.writeln("<br><a href=\"javascript:close_left1()\" title=\"关闭广告\">×<\/a><br><br><br><br>")document.writeln("<\/div>")//------左侧各块结束 document.writeln("<\/div>")document.writeln("<div id=\"rightDiv\" style=\"top:40pxright:5px\">")//------右侧各块结束 //---R1 document.writeln("<div id=\"right1\" class=\"itemFloat\">")document.writeln("<a href='huodong_kaixue.html'><img src=images\\index_ad_4_min.jpg width=100 height=300 /></a>")document.writeln("<br><a href=\"javascript:close_right1()\" title=\"关闭广告\">×<\/a><br><br><br><br>")document.writeln("<\/div>")//------右侧各块结束 document.writeln("<\/div>")
记得采纳啊
下面的代码调试通过，满足你的要求：
<div id="ad" style="position:absolute">
<a href="abc/abcd.htm" target="_blank">
<img src="PIC_0886.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 = truex = L}
if (x >R){ xin = falsex = R}
y = y + step*(yin?1:-1)
if (y <T) { yin = truey = T }
if (y >B) { yin = falsey = B }
}
var itl= setInterval("floatAD()", delay)
obj.onmouseover=function(){clearInterval(itl)}
obj.onmouseout=function(){itl=setInterval("floatAD()", delay)}
setTimeout("clearInterval(itl)ad.style.display='none'",5000)
</script>
你以前的代码第一行是多的，应该删除，我增加的一行实现5秒后取消，你把5000改为15000就能15秒取消。
