                        课程
                    
                        /前端开发
                        
                            /HTML/CSS
                        
                        /企业网站综合布局实战

在火狐和deamweaver里显示的不一样啊，而且检查不出自己哪里错了没人回答啊

<!doctype html>
<html>
<head>
<title>慕课网</title>
<link href="immoc.css" rel="stylesheet" type="text/css"/>
</head>
<body>
   <div class="top">
       <div class="top_content">
           <ul>
               <li><a href="#">联系我们</a></li>
               <li><a href="#">加入收藏</a></li>
               <li><a href="#">设为首页</a></li>
           </ul>
       </div>
   </div>
   <div class="wrap">
       <div class="logo">
               <div class="logo_left">
               <img src="images/logo.jpg" alt="慕课网"/>
           </div>
           <div class="logo_right">
               <img src="images/tel.jpg" alt="电话"/>24小时服务热线:<span class="tel">123-456-7890</span>
           </div>
       </div>
       <div class="nav">
           <div class="nav_left"> </div>
            <div class="nav_mid ">
              <div class="nav_mid_left">
                     <ul>
                      <li><a href="#">首页</a></li>
                      <li><a href="list.html">关于慕课</a></li>
                      <li><a href="list.html">新闻动态</a></li>
                      <li><a href="list.html">课程中心</a></li>
                       <li><a href="list.html">在线教程</a></li>
                       <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"/>
              </form>
              </div>
          </div>
           <div class="nav_right"></div>
       </div>
   </div>
</body>
</html>

------------------------------------------------------------------------------------------------------------------------------------------------

@charset "utf-8";
/* CSS Document */

*{margin:0;padding:0;font-size:12px}
body{
   background-color: #f5f5f5;
}
.top{width:100%;
      height: 27px;
      background: url(images/top_bg.jpg) repeat-x;
}
.top_content{
    width: 1000px;
    margin: 0 auto;
}

.top_content li{
    float: right;
    list-style-image: url(images/li_bg.gif);
    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:#FF0000;
    text-decoration: none;
}
.wrap{
    width: 1000px;
    margin: 0 auto;

}
.logo{
    height: 80px;
    background: #ffffff;
}
.logo_left{
    width: 200px;
    float: left;
}
.logo_right{
    height: 28px;
    margin-top: 30px;
    width: 300px;
    float: right;
    color: #8e8e8e;
}
.logo_right img{
   vertical-align: middle;
   margin-right:10px;
}
.tel{
   font-family:"微软雅黑";
   color:#C00;
   font-size: 16px;
}
.nav{
   height: 40px;

}
.nav_left
{
   width: 10px;
   background: url(images/nav_left.jpg) no-repeat;
   float: left;
   height: 40px;

}
.nav_mid
{
   width: 980px;
   background: url(images/nav_bg.jpg) repeat-x;
   float: left;

}
.nav_right{
   width: 10px;
   background: url(images/nav_right.jpg) no-repeat;
   float: left;
   height: 40px;

}