求个图片自动切换JS代码解决方法

求个图片自动切换JS代码
三张图片循环切换，JS不太懂，最好能给我贴段能运行的代码，O(∩_∩)O谢谢。。

------解决方案--------------------
jquery的一个图切换插件，jquery.cycle.all
当然不要求什么过渡效果之类的话，直接写也挺简单

------解决方案--------------------
HTML code

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>淘宝首页图片轮播效果</title>
<style>
<!--
* {margin: 0;padding:0;}
body {background: #222;}
ol {list-style: none;}
img {border: 0 none;}
#slider {
 border: 1px solid #F60;
 width: 490px;
 height: 170px;
 overflow: hidden;
 position: relative;
 margin: 2em auto;
}
#slider .player {
 /*width: 2450px;
 height: 850px;*/
 position: absolute;
 top: 0px;
 left: 0px;
}
#slider .player li {
 width: 490px;
 height: 170px;
}
#slider .btns {
 position: absolute;
 right: 10px;
 bottom: 5px;
 height: 30px;
}
#slider .btns li {
 font: 13px Tahoma, Arial, 宋体, sans-serif;
 float: left;
 margin: 0 3px;
 border: 1px solid #F60;
 background-color: #FFF;
 color: #CC937A;
 opacity: .8;
 cursor: pointer;
 width: 20px;
 height: 20px;
 line-height: 19px;
 text-align: center;
 -moz-border-radius: 10px;
 -webkit-border-radius: 10px;
 border-radius: 10px;
}
#slider .btns li.active {
 background: #F60;
 color: #FFF;
 font-weight: bold;
 opacity: 1;
}
-->
</style>
<script>
//<![CDATA[
function $(id) {
 return document.getElementById(id);
};
function getByClass(className, context) {
/*
 * 功能说明：
 * 传入类名、节点名（默认document），获取context下类名为classNa的节点
 */
 context = context || document;
 if(context.getElementsByClassName) {
  return context.getElementsByClassName(className);
 } else {
  var nodes = [];
  var tags = context.getElementsByTagName('*');
  for(var i=0, len=tags.length; i<len; i++) {
   if(hasClass(tags[i], className)) {
    nodes.push(tags[i]);
   }
  }
  return nodes;
 }
}
function hasClass(node, className) {
/*
 * 功能说明：
 * 传入节点及一个类名，检查该节点是否含有传入的类名
 */
 var names = node.className.split(/\s+/);
 for(var i=0, len=names.length; i<len; i++) {
  if(names[i] == className) {
   return true;
  }
 }
 return false;
}
function animate(o,start,alter,dur,fx) {
/*
 * 功能说明：
 * 设置动画
 * o:要设置动画的对象
 * start:开始的对象
 * alter:总的对象
 * dur:动画持续多长时间
 * fx:动画类型
 */
 var curTime=0;
 var t=setInterval(function () {
  if (curTime>=dur) clearInterval(t);
  for (var i in start) {
   o.style[i]=fx(start[i],alter[i],curTime,dur)+"px";
  }
  curTime+=40;
 },40);
 return function () {
  clearInterval(t);
 };
}
var Tween = {
/*
 * 功能说明：
 * 加速运动
 * curTime:当前时间,即动画已经进行了多长时间,开始时间为0
 * start:开始值
 * alter:总的变化量
 * dur:动画持续多长时间
 */
 Linear:function (start,alter,curTime,dur) {return start+curTime/dur*alter;},//最简单的线性变化,即匀速运动
 Quad:{//二次方缓动
  easeIn:function (start,alter,curTime,dur) {
   return start+Math.pow(curTime/dur,2)*alter;
  },
  easeOut:function (start,alter,curTime,dur) {
   var progress =curTime/dur;
   return start-(Math.pow(progress,2)-2*progress)*alter;
  },
  easeInOut:function (start,alter,curTime,dur) {
   var progress =curTime/dur*2;
   return (progress<1?Math.pow(progress,2):-((--progress)*(progress-2) - 1))*alter/2+start;
  }
 },
};
function Player(btns, scrollContent, imgHeight, timeout, hoverClass) {
/*
 * btns:按钮，类型是数组
 * scrollContent:摇滚动的块，一个DOM对象，这里是ol
 * imgHeight:每一张图片的高度，当然，如果想改成左右滚动，这里传入每一张图片的宽，唯一需要注意的是每一张图片宽高必须相同，图片数量可调整
 * timeout:切换速度快慢，默认为1.5ms
 * hoverClass:每一个按钮激活时的类名
*/
 hoverClass = hoverClass || 'active';
 timeout = timeout || 1500;
 this.btns = btns;
 this.scrollContent = scrollContent;
 this.hoverClass = hoverClass;
 this.timeout = timeout;
 this.imgHeight = imgHeight;
 var _this = this;
 for(var i=0; i<btns.length; i++) {
  this.btns[i].index = i;
  btns[i].onmouseover = function() {
   _this.stop();
   _this.invoke(this.index);
  }
  btns[i].onmouseout = function() {
   _this.start();
  }
 }
 this.invoke(0);
}
Player.prototype = {
 constructor : Player,
 start : function() {
  var _this = this;
  this.stop();
  this.intervalId = setInterval(function() {
   _this.next();
  }, this.timeout);
 },
 stop: function() {
  clearInterval(this.intervalId);
 },
 invoke: function(n) {
  this.pointer = n;
  if(this.pointer >= this.btns.length) {
   this.pointer = 0;
  }
  this.clearHover();
  this.btns[this.pointer].className = this.hoverClass;
  //this.scrollContent.style.top = parseInt(-this.imgHeight * this.pointer) + 'px';
  var startVal = parseInt(this.scrollContent.style.top) || 0;
  var alterVal = (parseInt(-startVal - this.imgHeight * this.pointer));
  this.animateIterval && this.animateIterval();//修正快速切换时闪动
  this.animateIterval=animate(this.scrollContent, {top : startVal},{top : alterVal}, 1000, Tween.Quad.easeOut);
  //这里默认设置每张图滚动的总时间是1s
 },
 next: function() {
  this.invoke(this.pointer + 1);
 },
 clearHover: function() {
  for(var i=0; i<this.btns.length; i++) {
   this.btns[i].className = '';
  };
 }
}
window.onload = function() {
 var btns = getByClass('btns', $('slider'))[0].getElementsByTagName('li');
 var player = getByClass('player', $('slider'))[0];
 var player = new Player(btns, player, 170, 1500, undefined);
 player.start();
 //player.invoke(2);
}
//]]>
</script>
</head>
<body>
<div id="slider">
 <ol class="player">
  <li><a href=""><img src="http://shouji.cxdq.com/img/h004/h40/img200808311417230.gif" alt="1" /></a></li>
  <li><a href=""><img src="http://shouji.cxdq.com/img/h004/h40/img200808311417230.gif" alt="2" /></a></li>
  <li><a href=""><img src="http://shouji.cxdq.com/img/h004/h40/img200808311417230.gif" alt="3" /></a></li>
  <li><a href=""><img src="http://shouji.cxdq.com/img/h004/h40/img200808311417230.gif" alt="4" /></a></li>
  <li><a href=""><img src="http://shouji.cxdq.com/img/h004/h40/img200808311417230.gif" alt="5" /></a></li>
 </ol>
 <ol class="btns">
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
  <li>5</li>
 </ol>
</div>
</body>
</html>
求个图片自动切换JS代码解决方法

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