var speed3=10//速度数值越大速度越慢
demo2.innerHTML=demo1.innerHTML;
function Marquee()
{
	if(demo2.offsetWidth-demo.scrollLeft<=0)
	{
		demo.scrollLeft-=demo1.offsetWidth;
	}
	else
	{
		demo.scrollLeft++;
	}
}
var MyMar=setInterval(Marquee,speed3);
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed3)}