var speeda=300
pro_demo2.innerHTML=pro_demo1.innerHTML 
function Marqueea(){ 
var mm_moa = pro_demo.offsetHeight - pro_demo1.offsetHeight;
if(mm_moa<0) mm_moa=0;
if(pro_demo2.offsetHeight-pro_demo.scrollTop<=mm_moa)
pro_demo.scrollTop-=pro_demo1.offsetHeight 
else{ 
pro_demo.scrollTop+=5
} 
} 
var MyMara=setInterval(Marqueea,speeda) 
pro_demo.onmouseover=function() {clearInterval(MyMara)} 
pro_demo.onmouseout=function() {MyMara=setInterval(Marqueea,speeda)}