// JScript 文件
 var speed=70;

 function Marquee(){
     var postion=parseInt(document.getElementById("demo").scrollLeft)+parseInt(document.getElementById("demo").style.width);
     if(postion >= document.getElementById("demo").scrollWidth){			
        document.getElementById("demo").scrollLeft-=document.getElementById("demo1").offsetWidth;//回到首尾相连的地方
     }else{
         document.getElementById("demo").scrollLeft+=2;
     }
  }
  
function init(){
   var MyMar=setInterval(Marquee,speed);
    if(document.getElementById("demo1").offsetWidth > document.getElementById("demo").offsetWidth)
    {
         document.getElementById("demo2").innerHTML=document.getElementById("demo1").innerHTML;//复制一份让其首位相连
         document.getElementById("demo").onmouseover=function() {clearInterval(MyMar);}
         document.getElementById("demo").onmouseout=function() {MyMar=setInterval(Marquee,speed);}
    }	                   
}
                            
window.onload=init;