Firefox的问题

我有Firefox的一个问题，我在我的网站的顶部的下拉菜单，这是对CSS代码Firefox的问题

#zone-bar { 
background:#E5E5E5; 
min-height:30px; 
z-index:10; 
padding:5px 10px 0; 
} 
#zone-bar ul li { 
float:left; 
height:18px; 
margin-right:10px; 
position:relative; 
z-index:10; 
padding:5px 5px 0; 
} 
#zone-bar ul li:hover { 
background:#C0C0C0; 
} 
#zone-bar ul li a { 
color:#383838; 
display:block; 
float:left; 
font-size:1.1em; 
font-weight:700; 
height:23px; 
padding-right:3px; 
position:relative; 
right:-5px; 
text-decoration:none; 
top:-5px; 
} 
#zone-bar ul li a:hover,#zone-bar ul li a.zoneCur { 
background:url(images/right-hover.png) center right no-repeat; 
z-index:10; 
} 
#zone-bar ul li a span { 
position:relative; 
top:6px; 
} 
#zone-bar ul li ul { 
background:#FFF; 
border:1px solid #ccc; 
display:none; 
left:0; 
position:absolute; 
top:29px; 
width:150px; 
padding:10px 0 0; 
} 
#zone-bar ul li ul li { 
float:none; 
height:100%; 
margin:0; 
padding:0; 
} 
#zone-bar ul li ul li:hover { 
background:none; 
} 
#zone-bar ul li ul li a { 
display:block; 
float:none; 
margin-left:-5px; 
width:140px; 
padding:5px 0 0 10px; 
} 
#zone-bar ul li ul li a:hover { 
background:#C0C0C0; 
} 
#zone-bar ul { 
display:block; 
}

这是我的HTML代码

<div id="zone-bar"> 
    <ul><li> 
    <a href="#"><span>My Account &nbsp; <em><img src="images/arrow.png" alt="dropdown"></em></span></a> 
     <ul> 
      <li><a href="#">My Account</a></li> 
      <li><a href="#">My Channel</a></li> 
      <li><a href="#">My Videos</a></li> 
      <li><a href="#">Favorites</a></li> 
      <li><a href="#">Playlists</a></li> 
      <li><a href="#">Friend Requests (1)</a></li> 
      <li><a href="#">Logout</a></li> 
    </ul></li> 
    <li> 
    <a href="#"><span>Messages &nbsp; <em><img src="images/arrow.png" alt="dropdown"></em></span></a> 
     <ul> 
      <li><a href="#">Messages (1)</a></li> 
      <li><a href="#">Compose New Message</a></li> 
      <li><a href="#">Notifications (0)</a></li> 
    </ul></li>    
    <li> 
    <a href="#"><span>Videos &nbsp; <em><img src="images/arrow.png" alt="dropdown"></em></span></a> 
     <ul> 
        <li><a href="#">Recent</a></li> 
        <li><a href="#">Viewed</a></li> 
        <li><a href="#">Featured</a></li> 
        <li><a href="#">Top Rated</a></li> 
        <li><a href="#">Commented</a></li> 
    </ul></li> 
    <li> 
    <a href="#"><span>Channels &nbsp; <em><img src="images/arrow.png" alt="dropdown"></em></span></a> 
     <ul> 
        <li><a href="#">Recent</a></li> 
        <li ><a href="#">Viewed</a></li> 
        <li ><a href="#">Featured</a></li> 
        <li ><a href="#">Top Rated</a></li> 
        <li ><a href="#">Commented</a></li> 
    </ul></li> 
    <li> 
    <a href="#"><span>Groups &nbsp; <em><img src="images/arrow.png" alt="dropdown"></em></span></a> 
     <ul> 
      <li><a href="#">Create New Group</a></li> 
         <li><a href="#">All Time</a></li>  
         <li><a href="#">Today</a></li>  
         <li><a href="#">Yesterday</a></li>  
         <li><a href="#">This Week</a></li>  
         <li><a href="#">Last Week</a></li>  
         <li><a href="#">This Month</a></li>  
         <li><a href="#">Last Month</a></li>  
         <li><a href="#">This Year</a></li>  
         <li><a href="#">Last Year</a></li>     
    </ul></li> 
    <li> 
    <a href="#"><span>Upload &nbsp; <em><img src="images/arrow.png" alt="dropdown"></em></span></a> 
       <ul> 
         <li><a href="#">Upload New Video</a></li> 
         <li><a href="#">My Videos</a></li> 
    </ul></ul> 
    </div>

你可以在doctorwhohd.com上看到现场演示

im正面临的问题是，除了Firefox之外，普通的所有浏览器都是这样，当你将鼠标悬停在项目上时，它看起来像这样 alt text http://www.freeimagehosting.net/uploads/4f5c4e70ab.png

在Firefox所有版本我得到这个 alt text http://www.freeimagehosting.net/uploads/4c9689da0b.png

任何帮助将是巨大的！因为这是我似乎无法修复的问题，并且我确定有一些遗漏。

来源

2010-07-07 cameronmarklewis