<!--
				var speed=20; //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(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)};
				-->