// JavaScript Document
var speed=25; //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-=tab1.offsetWidth
    	else{
    		tab.scrollLeft++;
    	}
    }
	var MyMar=setInterval(Marquee,speed);
    tab.onmouseover=function() {clearInterval(MyMar)};
    tab.onmouseout=function() {MyMar=setInterval(Marquee,speed)};