Jquery图片自动轮播

<style type="text/css">
#banner {position:relative; width:280px; height:300px; border:1px solid #666; overflow:hidden;}
#banner_list img {border:0px;}
#banner_bg {position:absolute; bottom:0;background-color:#000;height:30px;filter: Alpha(Opacity=30);opacity:0.3;z-index:1000;
cursor:pointer; width:478px; }
#banner_info{position:absolute; bottom:0; left:5px;height:22px;color:#fff;z-index:1001;cursor:pointer}
#banner_text {position:absolute;width:120px;z-index:1002; right:3px; bottom:3px;}
#banner ul {position:absolute;list-style-type:none;filter: Alpha(Opacity=80);opacity:0.8; border:1px solid #fff;z-index:1002;
            margin:0; padding:0; bottom:3px; right:5px;}
#banner ul li { padding:0px 8px;float:left;display:block;color:#FFF;border:#e5eaff 1px solid;background:#6f4f67;cursor:pointer}
#banner ul li.on { background:#900}
#banner_list a{position:absolute;} <!-- 让四张图片都可以重叠在一起-->
</style>

<div id="banner">    
    <div id="banner_bg"></div>  <!--标题背景-->
    <div id="banner_info"></div> <!--标题-->
    <ul>
        <li class="on">1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
    </ul>
   <div id="banner_list">
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<a href="http://click.union.360buy.com/JdClick/?unionId=5423&t=4&to=http://book.360buy.com/10903163.html" target="_blank"><img src="http://img10.360buyimg.com/n11/15254/f1b34a33-0d84-4e3f-9f81-551100c84136.jpg" title="星火英语：考研英语词汇星火式巧记速记（2013）" alt="星火英语：考研英语词汇星火式巧记速记（2013）" /></a>
<a href="http://click.union.360buy.com/JdClick/?unionId=5423&t=4&to=http://book.360buy.com/10903189.html" target="_blank"><img src="http://img10.360buyimg.com/n11/12503/bdc02e3b-760d-498f-9c5a-a6d48f196c6a.jpg" title="星火英语·考研英语：词汇必背（2013）（附光盘1张）" alt="星火英语·考研英语：词汇必背（2013）（附光盘1张）" /></a>
<a href="http://click.union.360buy.com/JdClick/?unionId=5423&t=4&to=http://book.360buy.com/10860425.html" target="_blank"><img src="http://img10.360buyimg.com/n11/19844/1c397a52-45fe-4e79-9e63-3225f3668b73.jpg" title="2013考研：数学公式的奥秘" alt="2013考研：数学公式的奥秘" /></a>
<a href="http://click.union.360buy.com/JdClick/?unionId=5423&t=4&to=http://book.360buy.com/10830606.html" target="_blank"><img src="http://img10.360buyimg.com/n11/11097/22f26dae-de89-42ef-8a1c-c67233c0c0e6.jpg" title="文都教育·2013考研英语词汇速记宝典" alt="文都教育·2013考研英语词汇速记宝典" /></a>
    </div>
</div>
<script type="text/javascript">
    var t = n = 0, count;
    $(document).ready(function(){    
        count=$("#banner_list a").length;
        $("#banner_list a:not(:first-child)").hide();
        $("#banner_info").html($("#banner_list a:first-child").find("img").attr('alt'));
        $("#banner_info").click(function(){window.open($("#banner_list a:first-child").attr('href'), "_blank")});
        $("#banner li").click(function() {
            var i = $(this).text() - 1;//获取Li元素内的值，即1，2，3，4
            n = i;
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            $("#banner_info").html($("#banner_list a").eq(i).find("img").attr('alt'));
            $("#banner_info").unbind().click(function(){window.open($("#banner_list a").eq(i).attr('href'), "_blank")})
            $("#banner_list a").filter(":visible").fadeOut(500).parent().children().eq(i).fadeIn(1000);
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            $(this).toggleClass("on");
            $(this).siblings().removeAttr("class");
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