<!--
var speed = 30; //数字越大速度越慢
var tab = document.getElementById("demo");
var tab1 = document.getElementById("demo1");
var tab2 = document.getElementById("demo2");
tab2.innerHTML = tab1.innerHTML;
function Marquee() {
	if(tab2.offsetWidth-tab.scrollLeft<=0) {
		tab.scrollLeft -= tab2.offsetWidth
	} else {
		tab.scrollLeft++;
	}
}
var MyMar = setInterval(Marquee,speed);
tab.onmouseover = function() {clearInterval(MyMar)};
tab.onmouseout = function() {MyMar=setInterval(Marquee,speed)};
-->