不知道怎么回事，救救孩子吧
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<head>
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<title>企业网站综合布局实战</title>
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myFocus.set({
id:'picbox'
})
</script>
<style>
*{
margin:0;
padding: 0;
font-size: 12px;
}
body{
background-color: #f5f5f5;
}
.top{
width: 100%;
height: 27px;
background-image: url(images/top_bg.jpg) ;
background-repeat: repeat-x;
}
.top-content{
width:1000px;
margin: 0 auto;
}
.top-content li{
list-style-image: url(images/li_bg.gif);
float:right;
width:70px;
line-height: 27px;
}
.top-content a:link,.top-content a:visited{
color: #8e8e8e;
text-decoration: none;
}
.top-content a:hover,.top-content a:active{
color: #900;
text-decoration: none;
}
.wrap{
width:990px;
margin:0 auto;
}
.logo{
height: 80px;
}
.logo-left{
width:200px;
float:left;
}
.logo-right{
width:300px;
float:right;
height: 28px;
margin-top: 30px;
color: #8e8e8e;
}
.logo-right img{
vertical-align: middle;
margin-right: 10px;
}
.tel{
font-family:"微软雅黑";
font-size: 16px;
color: #c00;
}
.nav{
height: 40px;
}
.nav-left{
width: 10px;
background-image: url(images/nav_left.jpg);
background-repeat: no-repeat;
float:left;
}
.nav-mid{
width: 980px;
background-image: url(images/nav_bg.jpg);
background-repeat: repeat-x;
float:left;
}
.nav-right{
width:10px;
background-image: url(images/nav_right.jpg);
background-repeat: no-repeat;
float:left;
}
.nav-left,.nav-mid,.nav-right{
float:left;
height: 40px;
}
.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-type: none;
width: 100px;
text-align: center;
line-height: 40px;
}
.nav-mid-left a:link,.nav-mid-left a:visited{
text-decoration: none;
color: #fff;
font-size: 16px;
font-family: "微软雅黑";
}
.nav-mid-left a:hover,.nav-mid-left a:active{
text-decoration: none;
color: #ff0;
font-size: 16px;
font-family: "微软雅黑";
}
.search-text{
width: 190px;
height: 25px;
margin-top: 7px;
background-image: url(images/search.jpg);
background-repeat: no-repeat;
background-position: right center;
background-color: #fff;
padding-right: 25px;
}
.ad{
width:990px;
height: 310px;
overflow: hidden;
}
</style>
</head>
<body>
<div class="top">
<div class="top-content">
<ul>
<li><a href="#" onclick="SetHome(window.location)">设为首页</a></li>
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<div class="wrap">
<div class="logo">
<div class="logo-left">
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</div>
</div><!-- logo结束 -->
<div class="nav">
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<div class="nav-mid-left">
<ul>
<li><a href="#">首页</a></li>
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<li><a href="list.html">人才招聘</a></li>
</ul>
</div>
<div class="nav-mid-right">
<form action="" method="post">
<input type="text" class="search-text">
</form>
</div>
</div>
<div class="nav-right"></div>
</div><!--nav结束 -->
<div class="ad" id="picbox">
<div class="loading"><img src="images/loading.gif" alt="图片加载中"></div>
<div class="pic">
<ul>
<li><img src="images/ad2.jpg" alt=""></li>
<li><img src="images/ad3.jpg" alt=""></li>
<li><img src="images/ad4.jpg" alt=""></li>
</ul>
</div>
</div><!--ad结束 -->
</div><!--wrap结束 -->
</body>
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