var t=demo.scrollWidth
demo1.innerHTML+=demo1.innerHTML
function doMarquee()
{
demo.scrollLeft=demo.scrollLeft<demo.scrollWidth-demo.offsetWidth?demo.scrollLeft+1:t-demo.offsetWidth
}
function doscroll()
{
   sc=setInterval(doMarquee,20)
}
function stopscroll()
{
   clearInterval(sc)
}
doscroll()