var speed5=25//速度数值越大速度越慢
xm2.innerHTML=xm1.innerHTML
function Marquee3(){
if(xm2.offsetHeight-xm.scrollTop<=0)
xm.scrollTop-=xm1.offsetHeight
else{
xm.scrollTop++
}
}
var XmMar=setInterval(Marquee3,speed5)
xm.onmouseover=function() {clearInterval(XmMar)}
xm.onmouseout=function() {XmMar=setInterval(Marquee3,speed5)}