var speed3=25;//速度数值越大速度越慢
var demo2 = document.getElementById('demo2');
var demo = document.getElementById('demo');
var demo1 = document.getElementById('demo1');
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)};