CSS |响应菜单

Question

我有一个菜单结构：

<ul id="nav_menu"> 
    <li><a href="#!index?category_id=3" class="subcategory">Electronics</a> 
     <ul> 
      <li><a href="#!index?category_id=15">Mobile phones</a></li> 
     </ul> 
    </li> 
    <li><a href="#!index?category_id=4">Computers</a></li> 
    <li><a href="#!index?category_id=5">Car Electronics</a></li> 
    <li><a href="#!index?category_id=6">TV &amp; Video</a></li> 
    <li><a href="#!index?category_id=7">Cell Phones</a></li> 
    <li><a href="#!index?category_id=8">MP3 Players</a></li> 
    <li><a href="#!index?category_id=9">Cameras &amp; Photo</a></li> 
    <li><a href="#!index?category_id=10">Apparel</a></li> 
    <li><a href="#!index?category_id=11">Music</a></li> 
    <li><a href="#!index?category_id=12">Movies &amp; TV</a></li> 
    <li><a href="#!index?category_id=13">Video Games</a></li> 
    <li><a href="#!index?category_id=14">Office Supplies</a></li> 
</ul> 

但它看起来象下面这样：

是可以优化的菜单，如果我有很多种类的，我的设备屏幕宽度狭窄？

我的CSS：

#nav_menu li { 
    display: inline; 
    float: left; 
    padding-right: 3px; 
    position: relative; 
} 

#nav_menu > li > a { 
    background: none repeat scroll 0 0 #404040; 
    border-radius: 3px 3px 0 0; 
    color: #FFFFFF; 
    display: block; 
    font-size: 14px; 
    font-weight: bold; 
    height: 28px; 
    line-height: 28px; 
    padding: 0 5px; 
    text-decoration: none; 
} 
#nav_menu ul { 
    background: none repeat scroll 0 0 #404040; 
    box-shadow: 0 0 1px rgba(0, 0, 0, 0.1); 
    list-style: none outside none; 
    margin: 0; 
    padding: 5px; 
    position: absolute; 
    top: 36px; 
    width: 140px; 
    z-index: 2; 
} 

Answer 1

像这样

DEMO

CSS

#nav_menu ul{ 
    margin:0; 
    padding:0; 
    float:left; 
} 
#nav_menu li { 
    display: inline; 
    float: left; 
    padding-right: 3px; 
    position: relative; 
    border-bottom:#FFD700 3px solid; 
} 

#nav_menu > li > a { 
    background: none repeat scroll 0 0 #404040; 
    border-radius: 3px 3px 0 0; 
    color: #FFFFFF; 
    display: block; 
    font-size: 14px; 
    font-weight: bold; 
    line-height: 20px; 
    padding: 0 5px; 
    text-decoration: none; 


} 
#nav_menu ul { 
    background: none repeat scroll 0 0 #404040; 
    box-shadow: 0 0 1px rgba(0, 0, 0, 0.1); 
    list-style: none outside none; 
    margin: 0; 
    padding: 5px; 
    position: absolute; 
    top: 20px; 
    width: 140px; 
    z-index: 2; 
} 

Answer 2

prueba LO siguiente：

DEMO 1

JAVASCRIPT

$(document).ready(function() 
{ 
    $("div.po").set_ELEMENT(
    { 
     bgColor:'red', 

     click: function(oThis) 
     { 
      oThis.find('> div').css({'color':'red','background-color' : 'blue'}); 
     } 
    }); 
});