var demo = document.getElementById("state");
var demo1 = document.getElementById("state1");
var demo2 = document.getElementById("state2");
var speed = 45;   //滚动速度值，值越大速度越慢
demo2.innerHTML = demo1.innerHTML    //克隆demo2为demo1
function Marquee() {
	if (demo2.offsetTop - demo.scrollTop <= 0)    //当滚动至demo1与demo2交界时
		demo.scrollTop -= demo1.offsetHeight;   //demo跳到最顶端
	else {
		demo.scrollTop++;
	}
}
var MyMar = setInterval(Marquee, speed);        
demo.onmouseover = function() { clearInterval(MyMar) }    
demo.onmouseout = function() { MyMar = setInterval(Marquee, speed) }