var speed3=25//速度数值越大速度越慢
dttdemo2.innerHTML=dttdemo1.innerHTML
function Marquee(){
if(dttdemo2.offsetWidth-dttdemo.scrollLeft<=0)
dttdemo.scrollLeft-=dttdemo1.offsetWidth
else{
dttdemo.scrollLeft++
}
}
var MyMar=setInterval(Marquee,speed3)
dttdemo.onmouseover=function() {clearInterval(MyMar)}
dttdemo.onmouseout=function() {MyMar=setInterval(Marquee,speed3)}