先了解一下對象的幾個的屬性：
innerHTML:設置或獲取位于對象起始和結束標簽內的 HTML
scrollHeight: 獲取對象的滾動高度。
scrollLeft:設置或獲取位于對象左邊界和窗口中目前可見內容的最左端之間的距離
scrollTop:設置或獲取位于對象最頂端和窗口中可見內容的最頂端之間的距離
scrollWidth:獲取對象的滾動寬度
offsetHeight:獲取對象相對于版面或由父坐標 offsetParent 屬性指定的父坐標的高度
offsetLeft:獲取對象相對于版面或由 offsetParent 屬性指定的父坐標的計算左側位置
offsetTop:獲取對象相對于版面或由 offsetTop 屬性指定的父坐標的計算頂端位置
offsetWidth:獲取對象相對于版面或由父坐標 offsetParent 屬性指定的父坐標的寬度

好，先看這個向上滾動的代碼：

 <base >
 <div id=demo style=overflow:hidden;height:100;width:90;background:#214984;color:#ffffff><div id=demo1>
 <img src="images/flash8.gif">
 <img src="images/link/flashempire.gif">
 <img src="images/linklogo/shlogo.gif">
 <img src="images/link/deskcity.gif">
 <img src="images/linklogo/5dmeng.gif">
 <img src="/Upload/2004_Pack/logo.gif">
 <img src="images/link/flashskylogo.gif">
 <img src="images/link/5dlogo88.gif">
 <img src="/Upload/2004_Pack/link.gif">
 </div>
 <div id=demo2></div>
 </div>
   <script>
   var speed=30
   demo2.innerHTML=demo1.innerHTML file://克隆demo1為demo2
   function Marquee(){
   if(demo2.offsetTop-demo.scrollTop<=0) file://當滾動至demo1與demo2交界時
   demo.scrollTop-=demo1.offsetHeight  file://demo跳到最頂端
   else{
   demo.scrollTop++
   }
   }
   var MyMar=setInterval(Marquee,speed) file://設置定時器
   demo.onmouseover=function() {clearInterval(MyMar)}//鼠標移上時清除定時器達到滾動停止的目的
   demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}//鼠標移開時重設定時器
   </script>

 向下滾動：

<base >
  <div id=demo style=overflow:hidden;height:100;width:90;background:#214984;color:#ffffff><div id=demo1>
  <img src="images/flash8.gif">
  <img src="images/link/flashempire.gif">
  <img src="images/linklogo/shlogo.gif">
  <img src="images/link/deskcity.gif">
  <img src="images/linklogo/5dmeng.gif">
  <img src="/Upload/2004_Pack/logo.gif">
  <img src="images/link/flashskylogo.gif">
  <img src="images/link/5dlogo88.gif">
  <img src="/Upload/2004_Pack/link.gif">
  </div>
  <div id=demo2></div>
  </div>
    <script>
    var speed=30
    demo2.innerHTML=demo1.innerHTML
    demo.scrollTop=demo.scrollHeight
    function Marquee(){
    if(demo1.offsetTop-demo.scrollTop>=0)
    demo.scrollTop+=demo2.offsetHeight
    else{
    demo.scrollTop--
    }
    }
    var MyMar=setInterval(Marquee,speed)
    demo.onmouseover=function() {clearInterval(MyMar)}
    demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
    </script>

向左滾動： 

<base >
  <div id=demo style=overflow:hidden;height:33;width:500;background:#214984;color:#ffffff><table align=left cellpadding=0 cellspace=0 border=0><tr><td id=demo1 valign=top><img src="images/link/flashempire.gif"><img src="images/linklogo/shlogo.gif"><img src="images/link/deskcity.gif"><img src="images/linklogo/5dmeng.gif"><img src="/Upload/2004_Pack/logo.gif"><img src="images/link/flashskylogo.gif"><img src="images/link/5dlogo88.gif"><img src="/Upload/2004_Pack/link.gif"><img src="images/flash8.gif"></td><td id=demo2 valign=top></td></tr></table></div>
  <script>
  var speed=30
  demo2.innerHTML=demo1.innerHTML
  function Marquee(){
  if(demo2.offsetWidth-demo.scrollLeft<=0)
  demo.scrollLeft-=demo1.offsetWidth
  else{
  demo.scrollLeft++
  }
  }
  var MyMar=setInterval(Marquee,speed)
  demo.onmouseover=function() {clearInterval(MyMar)}
  demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
  </script>
 

向右滾動： 

<base >
  <div id=demo style=overflow:hidden;height:33;width:500;background:#214984;color:#ffffff><table align=left cellpadding=0 cellspace=0 border=0><tr><td id=demo1 valign=top><img src="images/link/flashempire.gif"><img src="images/linklogo/shlogo.gif"><img src="images/link/deskcity.gif"><img src="images/linklogo/5dmeng.gif"><img src="/Upload/2004_Pack/logo.gif"><img src="images/link/flashskylogo.gif"><img src="images/link/5dlogo88.gif"><img src="/Upload/2004_Pack/link.gif"><img src="images/flash8.gif"></td><td id=demo2 valign=top></td></tr></table></div>
  <script>
  var speed=30
  demo2.innerHTML=demo1.innerHTML
 demo.scrollLeft=demo.scrollWidth
  function Marquee(){
  if(demo.scrollLeft<=0)
  demo.scrollLeft+=demo2.offsetWidth
  else{
  demo.scrollLeft--
  }
  }
  var MyMar=setInterval(Marquee,speed)
  demo.onmouseover=function() {clearInterval(MyMar)}
  demo.onmouseout=function() {MyMar=setInterval(Marquee,speed)}
  </script>