var speed=10
 var demo=document.getElementById("demo");
var demo2=document.getElementById("demo2");
var demo1=document.getElementById("demo1");
var MyMar=setInterval(Marquee,speed) 
demo2.innerHTML=demo1.innerHTML 
demo.onmouseover=function() {clearInterval(MyMar)} 
demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)} 
function Marquee(){ 
if(demo2.offsetWidth-demo.scrollLeft<=0) 
   demo.scrollLeft-=demo1.offsetWidth 
else{ 
   demo.scrollLeft++ 
} 
}