banner图片轮转(利用jquery)

<!DOCTYPE HTML>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no,maximum-scale=1" />
	
	<link rel="stylesheet" href="http://dundunbook.sinaapp.com/js_css/reset.css">

	<script src="http://dundunbook.sinaapp.com/js_css/jquery-1.8.3.min.js"></script>
	<script src="http://dundunbook.sinaapp.com/js_css/jquery.query-2.1.7.js"></script>
	
	<script>
		window.setInterval(roll, 1000); 
		var cnt = 0;
		function roll()
		{
			if(cnt==0)
				$(".banner_content").animate({left:"-100%"});
			else if(cnt==1)
				$(".banner_content").animate({left:"-200%"});
			else if(cnt==2)
				$(".banner_content").animate({left:"-300%"});
			else if(cnt==3)
				$(".banner_content").animate({left:"0%"});
		
			cnt++;
			if(cnt>=4)
				cnt = 0;
		}
	</script>
	<style type="text/css">
		.banner_holder{
			height:200px;
			width:100%;
			overflow:hidden;
			position:relative;
		}
		.banner_content{
			height:200px;
			width:400%;
			position:absolute;
		}
		img{
			float:left;
		}
	</style>

	<title>Home Page</title>
</head>

<body>
	<div class="banner_holder">
		<div class="banner_content">
			<img src="img1.bmp" height="200px" width="25%" id="banner_img1" />
			<img src="img2.bmp" height="200px" width="25%" id="banner_img2" />
			<img src="img3.bmp" height="200px" width="25%" id="banner_img3" />
			<img src="img4.bmp" height="200px" width="25%" id="banner_img4" />
		</div>
	</div>
</body>
</html>

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