window.onload = function() {

                                    var mar = new Marquee("marquee");
                                    mar.Direction = 0;
                                    mar.Width = 270;
                                    mar.Height = 16;
                                    mar.Speed = 20;
                                    mar.Space = 0;
                                    mar.Start();


                                    MarqueeStart("marquee3", 2, 180, 150, 30, 0, "ul");
                                    MarqueeStart("marquee4", 2, 180, 150, 30, 0, "ul");



                                }


                                function Marquee(MarName) {
                                    this.ID = document.getElementById(MarName);
                                    this.Speed = 30; //数字越大速度越慢
                                    this.Direction = 2; //滚动方向：0代表左;1代表右;2代表上;3代表下 
                                    this.Width = 0; //高度
                                    this.Height = 0; //宽度
                                    this.Space = 0; //是否有间隙：0代表否;1代表是
                                    this.Tag = "ul"; //滚动内容的标签,默认是<p>，也可以是<ul>，实践证明：<p>与<ul>不能嵌套使用。其他标签暂时不推荐。
                                    //开始滚动 
                                    this.Start = function() {
                                        MarqueeStart(this, this.Direction, this.Width, this.Height, this.Speed, this.Space, this.Tag);
                                    }
                                    //停止滚动并释放对象
                                    this.End = function() {
                                        MarqueeEnd(this);
                                    }
                                }

                                function MarqueeStart(Mar, Direction, Width, Height, Speed, Space, Tag) {
                                    var msobj;
                                    if (typeof (Mar) == "string") {
                                        msobj = new Marquee(Mar);
                                    }
                                    if (typeof (Mar) == "object") {
                                        msobj = Mar;
                                    }
                                    if (!msobj.ID) return;
                                    msobj.ID.style.width = Width + "px";
                                    msobj.ID.style.height = Height + "px";
                                    msobj.ID.style.overflow = msobj.ID.style.overflowX = msobj.ID.style.overflowY = "hidden";
                                    msobj.Direction = Direction;
                                    msobj.Width = Width;
                                    msobj.Height = Height;
                                    msobj.Speed = Speed;
                                    msobj.Space = Space;
                                    msobj.Tag = Tag;
                                    msobj.InnerDiv = msobj.ID.getElementsByTagName("div")[0];
                                    if (!msobj.InnerDiv) return;
                                    msobj.InnerDiv.innerHTML += msobj.InnerDiv.innerHTML;
                                    msobj.Inner = msobj.ID.getElementsByTagName(Tag);
                                    if (!msobj.Inner) return;
                                    switch (Direction) {
                                        case 2:
                                            msobj.InnerDiv.style.width = Width + "px";
                                            msobj.Inner[0].style.width = Width + "px";
                                            msobj.Inner[1].style.width = Width + "px";
                                            if (Height >= msobj.Inner[1].offsetHeight || msobj.Space == 1) {
                                                msobj.Inner[0].style.paddingTop = Height + "px";
                                                msobj.Inner[1].style.paddingTop = Height + "px"; ;
                                            }
                                            break;
                                        case 3:

                                            msobj.InnerDiv.style.width = Width + "px";
                                            msobj.Inner[0].style.width = Width + "px";
                                            msobj.Inner[1].style.width = Width + "px";
                                            if (Height >= msobj.Inner[1].offsetHeight || msobj.Space == 1) {
                                                msobj.Inner[0].style.paddingBottom = Height + "px";
                                                msobj.Inner[1].style.paddingBottom = Height + "px";
                                            }
                                            break;
                                        default:
                                            msobj.InnerDiv.noWrap = true;
                                            if (Width >= msobj.Inner[1].offsetWidth || msobj.Space == 1) {
                                                msobj.Inner[0].style.paddingLeft = Width + "px";
                                                msobj.Inner[1].style.paddingLeft = Width + "px";
                                            }
                                            break;
                                    }

                                    msobj.ID.onmouseover = function() {
                                        clearInterval(msobj.TimerID);
                                    }

                                    msobj.ID.onmouseout = function() {
                                        clearInterval(msobj.TimerID);
                                        msobj.TimerID = funcInterval(MarqueeScroll, msobj.Speed, msobj);
                                    }
                                    msobj.TimerID = funcInterval(MarqueeScroll, msobj.Speed, msobj);

                                }

                                function MarqueeScroll(Mar) {

                                    switch (Mar.Direction) {
                                        case 0:
                                            if (Mar.Inner[1].offsetWidth - Mar.ID.scrollLeft <= 0)
                                                Mar.ID.scrollLeft -= Mar.Inner[0].offsetWidth;
                                            else {
                                                Mar.ID.scrollLeft++;
                                            }
                                            break;
                                        case 1:
                                            if (Mar.ID.scrollLeft == 0)
                                                Mar.ID.scrollLeft = Mar.Inner[1].offsetWidth;
                                            else {
                                                Mar.ID.scrollLeft--;
                                            }
                                            break;
                                        case 2:
                                            if (Mar.Inner[1].offsetHeight - Mar.ID.scrollTop <= 0)
                                                Mar.ID.scrollTop -= Mar.Inner[0].offsetHeight;
                                            else {
                                                Mar.ID.scrollTop++;
                                            }
                                            break;
                                        case 3:
                                            if (Mar.ID.scrollTop <= 0)
                                                Mar.ID.scrollTop = Mar.Inner[1].offsetHeight;
                                            else {
                                                Mar.ID.scrollTop--;
                                            }
                                            break;
                                    }
                                }

                                function MarqueeEnd(Mar) {
                                    if (!Mar) return;
                                    if (typeof (Mar.TimerID) == "number") {
                                        clearInterval(Mar.TimerID);
                                        Mar = null;
                                    }
                                }

                                function funcInterval(funcName, time) {
                                    var args = [];
                                    for (var i = 2; i < arguments.length; i++) {
                                        args.push(arguments[i]);
                                    }
                                    return window.setInterval(function() {
                                        funcName.apply(this, args);
                                    }, time);
                                }