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                        /企業(yè)網(wǎng)站綜合布局實(shí)戰(zhàn)

求指導(dǎo)，為什么我的焦點(diǎn)圖沒(méi)有效果？？

<!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>慕課網(wǎng)</title>
????<link?href="慕課網(wǎng)css.css"?type="text/css"?rel="stylesheet">
????<script?src="js"?type="text/javascript"></script>
????<script?src="js/mf-pattern/mF_YSlider.js"?type="text/javascript"></script>
????<link?href="js/mf-pattern/mF_YSlider.css"?type="text/css"?rel="stylesheet">
????<script?type="text/javascript">
????????myFocus.set({id:'picBox'});
????</script>
</head>
<body>
<div?class="top">
????<div?class="top_content">
????????<ul>
????????????<li><a?href="#">聯(lián)系我們</a></li>
????????????<li><a?href="#">加入收藏</a></li>
????????????<li><a?href="#">設(shè)為首頁(yè)</a></li>
????????</ul>
????</div>
</div><!--top結(jié)束-->
<div?class="wrap">
??????<div?class="logo">
??????????<div?class="logoleft">
??????????????<img?src="imgs/慕課網(wǎng)images/logo.jpg">
??????????</div>
??????????<div?class="logoright">
??????????????<img?src="imgs/慕課網(wǎng)images/tel.jpg">24小時(shí)服務(wù)熱線：<span?class="tel">123-456-7890</span>
??????????</div>
??????</div><!--logo結(jié)束-->
<div?class="nav">
????<div?class="nav_left"></div>
????<div?class="nav_mid">
????????<div?class="nav_mid_left">
????????????<ul>
????????????????<li><a?href="#">首頁(yè)</a>?</li>
????????????????<li><a?href="#">關(guān)于慕課</a>?</li>
????????????????<li><a?href="#">新聞動(dòng)態(tài)</a>?</li>
????????????????<li><a?href="#">課程中心</a>?</li>
????????????????<li><a?href="#">在線課程</a>?</li>
????????????????<li><a?href="#">人才招聘</a>?</li>
????????????</ul>
????????</div><!--nav_mid_left結(jié)束-->
????????<div?class="nav_mid_right">
????????????<form?method="post"?action="">
????????????????<input?type="text"?class="serch_text">
????????????</form>
????????</div>
????</div><!--nav_mid結(jié)束-->
????<div?class="nav_right"></div>
</div>????<!--nav結(jié)束-->
<div?class="ad"?id="picBox"><!--焦點(diǎn)圖盒子-->
????<div?class="pic"><!--內(nèi)容列表（li數(shù)目可以隨意增減）-->
????????<ul>
????????????<li><a?href="#"><img?src="imgs/慕課網(wǎng)images/ad2.jpg"?/></a></li>
????????????<li><a?href="#"><img?src="imgs/慕課網(wǎng)images/ad3.jpg"?/></a></li>
????????????<li><a?href="#"><img?src="imgs/慕課網(wǎng)images/ad4.jpg"?/></a></li>
????????</ul>
????</div>
</div>
</div><!--wrap結(jié)束-->

</body>
</html>

*{
????max-resolution:?0;
????padding:?0;
????font-size:?12px;
}
body{background:#F5F5F5;}
.top{width:?100%;height:?27px;background:?gray;background:?url(imgs/慕課網(wǎng)images/top_bg.jpg)?repeat-x;}
.top_content{width:?1000px;margin:?0?auto;}
.top_content?li{list-style-image:?url(imgs/慕課網(wǎng)images/li_bg.gif);float:?right;width:?70px;line-height:?27px;}/*list-style-img:url定義li的圖表。。。。line-height代表文字垂直居中*/
.top_content?a:link,.top_content?a:visited{color:#8E8E8E;text-decoration:?none;}/*link代表初始狀態(tài)顏色為灰色，vistied代表點(diǎn)擊后的狀態(tài)*/
.top_content?a:hover,.top_content?a:active{color:?red;text-decoration:?none;}/*hover代表鼠標(biāo)指針浮動(dòng)在上面的狀態(tài)顏色為紅色，vistied代表點(diǎn)擊時(shí)的狀態(tài)*/
.wrap{width:?1000px;margin:?0?auto;}
.logo{height:?80px;background:?#ffffff;}
.logoleft{width:200px;float:?left;}
.logoright{width:300px;float:?right;margin-top:30px;color:?#8E8E8E;?}
.logoright?img{vertical-align:?middle;margin-right:?10px;}/*電話圖片居中對(duì)齊代碼：vertical-align:middle*/
.tel{color:red;font-size:?16px;font-family:?微軟雅黑;}/*span屬性屬于內(nèi)聯(lián)屬性，不會(huì)獨(dú)占一行另行開始*/

.nav{height:?40px;}
.nav_left{width:?10px;background:?url(imgs/慕課網(wǎng)images/nav_left.jpg)?no-repeat;}
.nav_mid{width:?980px;background:?url(imgs/慕課網(wǎng)images/nav_bg.jpg)?repeat-x;}
.nav_right{width:10px;background:?url(imgs/慕課網(wǎng)images/nav_right.jpg)?no-repeat;}
.nav_mid,.nav_right,.nav_left{height:?40px;float:?left}

.nav_mid_left,.nav_mid_right{float:?left;}
.nav_mid_left{width:?680px;}
.nav_mid_right{width:?300px;}
.nav_mid_left?li{float:?left;list-style:?none;width:100px;text-align:?center;}/*list-style:none代表去掉li前面的小黑點(diǎn)樣式*/
.nav_mid_left?a:link,.nav_mid_left?a:visited{text-decoration:?none;color:?#ffffff;font-size:?16px;font-family:?微軟雅黑;}
.nav_mid_left?a:hover,.nav_mid_left?a:active{text-decoration:?none;color:#ffff00;font-size:?16px;font-family:?微軟雅黑;}
.serch_text{width:?190px;height:?25px;margin-top:?5px;background:?url(imgs/慕課網(wǎng)images/search.jpg)?no-repeat?right?center?#ffffff;padding-right:?25px;border:?#ffffff?solid?1px;}/*padding-right巧妙設(shè)置了輸入文本與放大鏡的距離*/

.ad{height:?310px;overflow:?hidden;}

求指導(dǎo)，為什么我的焦點(diǎn)圖不會(huì)動(dòng)？只是單張顯示。