var speed=120
pro_demo2.innerhtml=pro_demo1.innerhtml 
function marquee(){ 
if(pro_demo2.offsetwidth-pro_demo.scrollleft<=0) 
pro_demo.scrollleft-=pro_demo1.offsetwidth 
else{ 
pro_demo.scrollleft+=5
} 
} 
var mymar=setinterval(marquee,speed) 
pro_demo.onmouseover=function() {clearinterval(mymar)} 
pro_demo.onmouseout=function() {mymar=setinterval(marquee,speed)}