经过修改优化的图上滑动变换效果

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=gb2312" />
<title>简单的滑动效果</title>
<style type="text/css">
* {margin:0;padding:0;}
ul, li {list-style:none;}
.mid {margin:0 auto;}
.area {width:240px;height:200px;overflow:hidden;background:#999;margin-top:150px;position:relative;}
#pic_list {position:relative;}
#pic_list li {position:absolute;visibility:hidden;}
#pic_list li.show {visibility:visible;}
#pic_list li img {vertical-align:middle;}
.button {width:240px;height:20px;line-height:20px;background:#ccc;position:absolute;bottom:0px;}
#button {float:right;}
#button li {float:left;width:20px;height:20px;text-align:center;margin:0 3px;font-family:"Arial";font-size:12px;color:#fff;background:#000;}
#button li.current {background:#f00;cursor:pointer;}
</style>
</head>
<body>
<div class="area mid">
    <div id="imgbox" class="bbbb">
        <ul id="pic_list" class="aaaa">
            <li class="show" id="one"><img src="http://www.zzzyk.com/jscss/demoimg/wall1.jpg" width="240" /></li>
            <li id="two"><img src="http://http://www.zzzyk.com/jscss/demoimg/wall2.jpg" width="240" /></li>
            <li id="three"><img src="http://www.zzzyk.com/jscss/demoimg/wall3.jpg" width="240" /></li>
            <li id="four"><img src="http://www.zzzyk.com/jscss/demoimg/wall4.jpg" width="240"  /></li>
            <li id="five"><img src="http://www.zzzyk.com/jscss/demoimg/wall5.jpg" width="240" /></li>
        </ul>
    </div>
    <div class="button" class="dddd">
        <ul id="button" class="cccc">
            <li class="current" id="but_one">1</li><li id="but_two">2</li><li id="but_three">3</li><li id="but_four">4</li><li id="but_five">5</li>
        </ul>
    </div>
</div>
<script type="text/javascript">
(function(){
var imgbox = document.getElementById("imgbox");
var pic_list = document.getElementById("pic_list");
var pics = pic_list.getElementsByTagName("li");
var button = document.getElementById("button").getElementsByTagName("li");
var p;
var start;
function autoplay(start){for(i=start;i<button.length;i++){		//设置起始值为start参数.
	(function(){
		var p=i;  													// 为p赋值i. i等于0,1,2,3,4;
		button[i].onmouseover=function change(){    				//button[0],button[1],button[2],button[3],button[4]  onmouseover可以触发函数;
			for(j=0;j<this.parentNode.childNodes.length;j++){ 		//以this(当前触发事件的元素)为起点,的父节点的所有子节点的length值为最高值,开始遍历. ;
				this.parentNode.childNodes[j].className="";	 	    //以this(当前触发事件的元素)为起点,的父节点的所有子节点的className为空. 危险慎用.;
					}
			this.className="current";								//this. 即当前触发onmouseover的元素的className为"current";
			for(m=0;m<pics.length;m++){								//以pics.length为最高值进行遍历.遍历pics.;
				pics[m].className="";								//清空所有pics数组中所有元素的className;
				if (m==p){											//当m==p (p==i) 所以m=i时,触发下列函数
					pics[m].className="show";						//pics的第m个元素的className值为show; m在这里等于i;
					}
				}
			}
		})();
	}
}
autoplay(0);
})();
</script>
</body>
</html>
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