仿淘宝网的幻灯片代码，上下滑动效果

答案：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>淘宝幻灯片上下滑动效-www.zzzyk.com</title>
<style type="text/css">
* { padding: 0; margin: 0; }
li { list-style: none; }
img { border: none; }
body { background: #ecfaff; }
.play { width: 470px; height: 150px; overflow: hidden; position: relative; margin: 150px auto 0; }
ol { position: absolute; right: 5px; bottom: 5px; z-index: 2; }
ol li { float: left; margin-right: 3px; display: inline; cursor: pointer; background: #fcf2cf; border: 1px solid #f47500; padding: 2px 6px; color: #d94b01; font-family: arial; font-size: 12px; }
.active { padding: 3px 8px; font-weight: bold; color: #ffffff; background: #ffb442; position: relative; bottom: 2px; }
ul { position: absolute; top: 0; left: 0; z-index: 1; }
ul li { width: 470px; height: 150px; float: left; }
ul img { float: left; width: 470px; height: 150px; }
</style>
<script type="text/javascript" >
window.onload=function()
{
	var oPlay=document.getElementById('play');
	var oOl=oPlay.getElementsByTagName('ol')[0];
	var aLi1=oOl.getElementsByTagName('li');
	var oUl=oPlay.getElementsByTagName('ul')[0];
	var aLi2=oUl.getElementsByTagName('li');
	var i=iNum=direction=0;
	var times=null;
	var play=null;
	
	for(i=0;i<aLi1.length;i++)
	{
		aLi1[i].index=i;
		aLi1[i].onclick=function()
		{
			iNum=this.index;
			show();
		};
	}
	//按钮点击后调用的函数
	function show()
	{
		for(i=0;i<aLi1.length;i++)
		{
			aLi1[i].className='';
		}
		aLi1[iNum].className='active';
		startMove(-(iNum*150));
	}
	//自动播放转向
	function autoPlay()
	{
		if(iNum>=aLi1.length-1)
		{
			direction=1;
		}
		else if(iNum<=0)
		{
			direction=0;
		}
		
		if(direction==0)
		{
			iNum++;
		}
		else if(direction==1)
		{
			iNum--;
		}
		show();
	}
	//自动播放
	play=setInterval(autoPlay,3000);
	
	//鼠标移入展示区停止自动播放
	oPlay.onmouseover=function()
	{
		clearInterval(play);
	};
	//鼠标移出展示区开启自动播放
	oPlay.onmouseout=function()
	{
		play=setInterval(autoPlay,3000);
	};
	
	function startMove(iTarget)
	{
		clearInterval(times);
		times=setInterval(function()
		{
			doMove(iTarget);
		},30);
	}
	function doMove(iTarget)
	{
		
		var iSpeed=(iTarget-oUl.offsetTop)/10;
		iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
		
		if(oUl.offsetTop==iTarget)
		{
			clearInterval(times)
		}
		else
		{
			oUl.style.top=oUl.offsetTop+iSpeed+'px';
		}
		
	}
};
</script>
</head>

<body>

<div class="play" id="play">
    <ol>
    	<li class="active">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ol>
	<ul>
		<li><a href="javascript:;"><img src="/jscss/demoimg/201108/1.jpg" alt="广告一" /></a></li>
		<li><a href="javascript:;"><img src="/jscss/demoimg/201108/2.jpg" alt="广告二" /></a></li>
		<li><a href="javascript:;"><img src="/jscss/demoimg/201108/3.jpg" alt="广告三" /></a></li>
		<li><a href="javascript:;"><img src="/jscss/demoimg/201108/4.jpg" alt="广告四" /></a></li>
		<li><a href="javascript:;"><img src="/jscss/demoimg/201108/5.jpg" alt="广告五" /></a></li>
	</ul>
</div>
</body>
</html>
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