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纯div+css制作的弹出菜单

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<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>二级dropdown弹出菜单--A CROSS BROWSER DROP DOWN CASCADING VALIDATING MENU</title>
<style type="text/css">
/* common styling */
/* set up the overall width of the menu div, the font and the margins */
.menu {
font-family: arial, sans-serif; 
width:750px; 
margin:0; 
margin:50px 0;
}
/* remove the bullets and set the margin and padding to zero for the unordered list */
.menu ul {
padding:0; 
margin:0;
list-style-type: none;
}
/* float the list so that the items are in a line and their position relative so that the drop down list will appear in the right place underneath each list item */
.menu ul li {
float:left; 
position:relative;
}
/* style the links to be 104px wide by 30px high with a top and right border 1px solid white. Set the background color and the font size. */
.menu ul li a, .menu ul li a:visited {
display:block; 
text-align:center; 
text-decoration:none; 
width:104px; 
height:30px; 
color:#000; 
border:1px solid #fff;
border-width:1px 1px 0 0;
background:#c9c9a7; 
line-height:30px; 
font-size:11px;
}
/* make the dropdown ul invisible */
.menu ul li ul {
display: none;
}
/* specific to non IE browsers */
/* set the background and foreground color of the main menu li on hover */
.menu ul li:hover a {
color:#fff; 
background:#b3ab79;
}
/* make the sub menu ul visible and position it beneath the main menu list item */
.menu ul li:hover ul {
display:block; 
position:absolute; 
top:31px; 
left:0; 
width:105px;
}
/* style the background and foreground color of the submenu links */
.menu ul li:hover ul li a {
display:block; 
background:#faeec7; 
color:#000;
}
/* style the background and forground colors of the links on hover */
.menu ul li:hover ul li a:hover {
background:#dfc184; 
color:#000;
}
</style>
<!--[if lte IE 6]>
<style type="text/css">
/* styling specific to Internet Explorer IE5.5 and IE6. Yet to see if IE7 handles li:hover */
/* Get rid of any default table style */
table {
border-collapse:collapse;
margin:0; 
padding:0;
}
/* ignore the link used by ‘other browsers‘ */
.menu ul li a.hide, .menu ul li a:visited.hide {
display:none;
}
/* set the background and foreground color of the main menu link on hover */
.menu ul li a:hover {
color:#fff; 
background:#b3ab79;
}
/* make the sub menu ul visible and position it beneath the main menu list item */
.menu ul li a:hover ul {
display:block; 
position:absolute; 
top:32px; 
left:0; 
width:105px;
}
/* style the background and foreground color of the submenu links */
.menu ul li a:hover ul li a {
background:#faeec7; 
color:#000;
}
/* style the background and forground colors of the links on hover */
.menu ul li a:hover ul li a:hover {
background:#dfc184; 
color:#000;
}
</style>
<![endif]-->
</head>
<body>
<div class="menu">
<ul>
<li><a class="hide" href="../menu/index.html">DEMOS</a>
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<a href="http://www.mamicode.com/menu/index.html">DEMOS
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    <li><a href="../menu/form.html" title="Styling forms">styled form</a></li>
    <li><a href="../menu/nodots.html" title="Removing active/focus borders">active focus</a></li>
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    <li><a href="../menu/old_master.html" title="Image Map for detailed information">image map</a></li>
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<a href="http://www.mamicode.com/index.html">MENUS
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    <ul>
    <li><a href="spies.html" title="a coded list of spies">spies menu</a></li>
    <li><a href="vertical.html" title="a horizontal vertical menu">vertical menu</a></li>
    <li><a href="expand.html" title="an enlarging unordered list">enlarging list</a></li>
    <li><a href="enlarge.html" title="an unordered list with link images">link images</a></li>
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    <ul>
    <li><a href="../layouts/bodyfix.html" title="Cross browser fixed layout">Fixed 1</a></li>
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    <li><a href="spies.html" title="a coded list of spies">spies menu</a></li>
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    <li><a href="../mozilla/dropdown.html" title="A drop down menu">drop down menu</a></li>
    <li><a href="../mozilla/cascade.html" title="A cascading menu">cascading menu</a></li>
    <li><a href="../mozilla/content.html" title="Using content:">content:</a></li>
    <li><a href="../mozilla/moxbox.html" title=":hover applied to a div">mozzie box</a></li>
    <li><a href="../mozilla/rainbow.html" title="I can build a rainbow">rainbow box</a></li>
    <li><a href="../mozilla/snooker.html" title="Snooker cue">snooker cue</a></li>
    <li><a href="../mozilla/target.html" title="Target Practise">target practise</a></li>
    <li><a href="../mozilla/splittext.html" title="Two tone headings">two tone headings</a></li>
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    </ul>
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    <li><a href="../ie/exampleone.html" title="Example one">example one</a></li>
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    <li><a href="../ie/exampletwo.html" title="Vertical align">vertical align</a></li>
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    <li><a href="../opacity/colours.html" title="colour wheel">opaque colours</a></li>
    <li><a href="../opacity/picturemenu.html" title="a menu using opacity">opaque menu</a></li>
    <li><a href="../opacity/png.html" title="partial opacity">partial opacity</a></li>
    <li><a href="../opacity/png2.html" title="partial opacity II">partial opacity II</a></li>
    </ul>
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