marquee循环滚动

<!--滚动广告开始 -->
<DIV id=ad style="POSITION: absolute; z-index:99">
<DIV style="FONT-SIZE: 9pt; CURSOR: hand;" onclick=hidead(); align=right>关闭×</DIV><A href="#"
target=_blank><IMG src="/E-biz.jpg" border=0> </A></DIV>
< script >
var x = 50,y = 60
var xin = true, yin = true
var step = 1
var delay = 25
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()
obj.onmouseout=function(){itl=setInterval("floatAD()", delay)}
</ script >
< script type=text/java script >
function hidead()
{document.getElementById("ad").style.display="none";}
</ script >
<!--滚动广告结束 -->

 

<marquee behavior="alternate" direction="up" scrollamount="1" onMouseOver=this.stop() onMouseOut=this.start() >我上下来回滚动</marquee>