var speed3=10//速度数值越大速度越慢
var t=false;
var id="aa";

document.getElementById("demo2").innerHTML=document.getElementById("demo1").innerHTML;

function Marquee(){
	if(document.getElementById("demo2").offsetWidth-document.getElementById("demo").scrollLeft<=0)
		document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth;
	else{
		document.getElementById("demo").scrollLeft++;
	}
		t=false;
}
	 
function RMarquee(){ 
	if(document.getElementById("demo").scrollLeft<=0)
		document.getElementById("demo").scrollLeft+=document.getElementById("demo2").offsetWidth;
	else{
		document.getElementById("demo").scrollLeft--;
	}
		t=true;
}
	
function clickdiv(){
	clearInterval(MyMar);
	Marquee();
}

var MyMar = setInterval(Marquee,speed3);
document.getElementById("demo").onmouseover=function(){clearInterval(MyMar)};
document.getElementById("demo").onmouseout=function(){if(t){MyMar=setInterval(RMarquee,speed3)}else{MyMar=setInterval(Marquee,speed3)}};

function clickLeft(){
	document.getElementById("demo").scrollLeft+=222*3;
}

function clickRight(){
	if(document.getElementById("demo2").offsetWidth-document.getElementById("demo").scrollLeft<=0)
		document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth;
	else{
	document.getElementById("demo").scrollLeft-=222*3;
	}
}