var Mar = document.getElementById("Marquee");
var child_div = Mar.getElementsByTagName("li")
var picH = 25; //移动高度
var scrollstep = 3; //移动步幅,越大越快
var scrolltime = 50; //移动频度(毫秒)越大越慢
var stoptime = 3000; //间断时间(毫秒)
var tmpH = 0;
Mar.innerHTML += Mar.innerHTML;
function start() {
    if (tmpH < picH) {
        tmpH += scrollstep;
        if (tmpH > picH) tmpH = picH;
        Mar.scrollTop = tmpH;
        setTimeout(start, scrolltime);
    } else {
        tmpH = 0;
        Mar.appendChild(child_div[0]);
        Mar.scrollTop = 0;
        setTimeout(start, stoptime);
    }
}
onload = function() { setTimeout(start, stoptime) };