/*var speed3=25//速度数值越大速度越慢
demo2.innerHTML=demo1.innerHTML
function Marquee(){
if(demo2.offsetWidth-demo.scrollLeft<=0)
demo.scrollLeft-=demo1.offsetWidth
else{
demo.scrollLeft++
}
}
var MyMar=setInterval(Marquee,speed3)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed3)}*/

window.onload=function(){
var speed1=30	//图片左移的速度
var MyMar1	//setInterverval方法返回的间隔ID,些ID为全局的调用次数(用于第一行图片)
document.getElementById("demo2").innerHTML=document.getElementById("demo1").innerHTML
function Marquee1(){
if(document.getElementById("demo2").offsetWidth-document.getElementById("demo").scrollLeft<=0){
document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth
}
else{
	document.getElementById("demo").scrollLeft++
}
}
MyMar1=setInterval(Marquee1,speed1)
document.getElementById("demo").onmouseover=function() 
{clearInterval(MyMar1);}
document.getElementById("demo").onmouseout=function() 
{MyMar1=setInterval(Marquee1,speed1);}}