var ij=0;t=demo.scrollTop 

demo2.innerHTML=demo1.innerHTML 

function qswhMarquee2(){ 

if (ij==1)return 

if(demo2.offsetTop-demo.scrollTop<=0) 

demo.scrollTop-=demo1.offsetHeight 

else 

demo.scrollTop++

} 

setInterval(qswhMarquee2,18)