window.onload = function(){
	var speed=10; //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)};

	var speed_1=10; //数字越大速度越慢
	var tab_1=document.getElementById("demo_1");
	var tab1_1=document.getElementById("demo1_1");
	var tab2_1=document.getElementById("demo2_1");
	tab2_1.innerHTML=tab1_1.innerHTML;
	function Marquee_1(){
	if(tab2_1.offsetWidth-tab_1.scrollLeft<=0)
	tab_1.scrollLeft-=tab1_1.offsetWidth
	else{
	tab_1.scrollLeft++;
	}
	}
	var MyMar_1=setInterval(Marquee_1,speed_1);
	tab_1.onmouseover=function() {clearInterval(MyMar_1)};
	tab_1.onmouseout=function() {MyMar_1=setInterval(Marquee_1,speed_1)};
	
	
	
	var speed_2=10; //数字越大速度越慢
	var tab_2=document.getElementById("demo_2");
	var tab1_2=document.getElementById("demo1_2");
	var tab2_2=document.getElementById("demo2_2");
	tab2_2.innerHTML=tab1_2.innerHTML;
	function Marquee_2(){
	if(tab2_2.offsetWidth-tab_2.scrollLeft<=0)
	tab_2.scrollLeft-=tab1_2.offsetWidth
	else{
	tab_2.scrollLeft++;
	}
	}
	var MyMar_2=setInterval(Marquee_2,speed_2);
	tab_2.onmouseover=function() {clearInterval(MyMar_2)};
	tab_2.onmouseout=function() {MyMar_2=setInterval(Marquee_2,speed_2)};
}