var speed = 50
var _demo = document.getElementById("demo");
var _demo1 = document.getElementById("demo1");
var _demo2 = document.getElementById("demo2");
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)
}