在做导航栏目的时候,总是遇到一个奇怪的bug

这里面还没有增加什么Css样式,但是这里始终就是有一块空格,实在不知道哪来的
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>mukeplus</title>
<link rel="stylesheet" href="css/index.css" type="text/css">
<script src="js/setHomeSetFav.js" type="text/javascript" charset = "gb2312"></script>
</head>
<body>
<div>
<div>
<ul>
<li><a href="#">add_home</a></li>
<li><a href="#" onClick = "AddFavorite(window.location,document.title)">add_to_share</a></li>
<li><a href="#" onClick = "SetHome(window.location)">contact_us</a></li>
</ul>
</div>
<!-- top ending -->
</div>
<div>
<div>
<div>
<img src="images/logo.jpg" alt="mukewang">
</div>
<div>
<img src="images/tel.jpg" alt="contact_to_us">24hours_waiting_for_you <span> 020-245-135-23</span>
</div>
</div>
<!-- logo ending -->
<div>
<div></div>
<div>
<div>
<li><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">News</a></li>
<li><a href="#">Lessons</a></li>
<li><a href="#">Online</a></li>
<li><a href="#">Need</a></li>
</div>
<div>
<form action="post" action= "">
<input type="text">
</form>
</div>
</div>
<div></div>
</div>
<!-- nav ending -->
</div>
<!-- wrap ending -->
</body>
</html>
下面是CSS
*{
margin:0px;
padding: 0px;
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{
list-style-image: url(../images/li_bg.gif);
float: right;
width:80px;
line-height: 27px;
}
.top_content a:link,.top_content a:visited{
color:#8E8E8E;
text-decoration: none;
}
.top_content a:active,.top_content a:hover{
color: #900;
}
.wrap{
width: 1000px;
margin: 0 auto;
}
.logo{
height:80px;
background: #FFF;
}
.logo_left{
width:200px;
float: left;
}
.logo_right{
color: #8E8E8E;
width:300px;
float: right;
height: 28px;
margin-top:30px;
}
.logo_right img{
vertical-align: middle;
margin-right:8px;
}
.tel{
font-family: yahei;
font-size: 16px;
color:orange;
}