var speed = 50
                        demo2.innerHTML = demo1.innerHTML
                        function Marquee() {
                            if (demo2.offsetTop - demo.scrollTop <= 0)
                                demo.scrollTop -= demo1.offsetHeight
                            else {
                                demo.scrollTop++
                            }
                        }
                        var MyMar = setInterval(Marquee, speed)
                        demo.onmouseover = function() { clearInterval(MyMar) }
                        demo.onmouseout = function() { MyMar = setInterval(Marquee, speed) }