//调用向左滚动
var speed=8//速度数值越大速度越慢

var isIE = document.all;   //判断是否非ie
var firefox = document.getElementById && !document.all;   //这段是为了兼容火狐，w3c标准

if(isIE==false){
   demo = document.getElementById("demo");     //非w3c标准要找到表单，必须是要用getElementById("XX");
   demo1 = document.getElementById("demo1");
   demo2 = document.getElementById("demo2");
}
if(firefox==true){
   demo = document.getElementById("demo");
   demo1 = document.getElementById("demo1");
   demo2 = document.getElementById("demo2");
}


demo2.innerHTML=demo1.innerHTML

function Marquee(){
   if(demo2.offsetWidth-demo.scrollLeft<=0)
     demo.scrollLeft-=demo1.offsetWidth
   else{
     demo.scrollLeft++
   }
}
var MyMar=setInterval(Marquee,speed)
demo.onmouseover=function() {clearInterval(MyMar)}
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}