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图片循环滚动-左右按钮滚动精简代码

网页上的图片滚动,两端带控制按钮,可以向左、向右滚动。这里请注意DY_scroll函数内的参数,true为自动播放,不加此参数或false就默认不自动滚动。
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>图片特效</title>
<style type="text/css">
	body,ul,li { padding:0; margin:0}
	ul,li { list-style:none}
	.img-scroll { position:relative; margin:20px auto; width:440px;}
	.img-scroll .prev,.img-scroll .next { position:absolute; display:block; width:50px; height:100px; background-color:#000;
	top:0; color:#FFF; text-align:center; line-height:100px}
	.img-scroll .prev { left:0}
	.img-scroll .next { right:0}
	.img-list { position:relative; width:320px; height:100px; margin-left:60px; overflow:hidden}
	.img-list ul { width:9999px;}
	.img-list li { float:left; display:inline; width:100px; margin-right:10px; height:100px; background-color:#BDBDDF; text-align:center; line-height:100px;}
</style>
</head>
<body>
<div class="img-scroll">
<span class="prev">prev</span>
    <span class="next">next</span>
    <div class="img-list">
    	<ul>
        	<li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
        </ul>
    </div>
</div>
<script type="text/javascript" src="/ajaxjs/jquery-1.4.2.min.js"></script>
<script type="text/javascript">
	function DY_scroll(wraper,prev,next,img,speed,or)
	{	
		var wraper = $(wraper);
		var prev = $(prev);
		var next = $(next);
		var img = $(img).find('ul');
		var w = img.find('li').outerWidth(true);
		var s = speed;
		next.click(function()
							{
								img.animate({'margin-left':-w},function()
																		{
																			img.find('li').eq(0).appendTo(img);
																			img.css({'margin-left':0});
																			});
								});
		prev.click(function()
							{
								img.find('li:last').prependTo(img);
								img.css({'margin-left':-w});
								img.animate({'margin-left':0});
								});
		if (or == true)
		{
			ad = setInterval(function() { next.click();},s*1000);
			wraper.hover(function(){clearInterval(ad);},function(){ad = setInterval(function() { next.click();},s*1000);});
		}
	}
	DY_scroll('.img-scroll','.prev','.next','.img-list',3,true);// true为自动播放,不加此参数或false就默认不自动
</script>
</body>
</html>

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