完全CSS下拉菜单，只用CSS，纯CSS构筑！

<style type=\"text/css\">
.menu {
font-family: verdana, sans-serif;
width:750px;
position:relative;
font-size:0.85em;
padding-bottom:250px;
}
.menu ul {
padding:0;
margin:0;
list-style-type: none;
}
.menu ul li {
float:left;
position:relative;
}
.menu ul li a, .menu ul li a:visited {
display:block;
text-decoration:none;
color:#000;
width:139px;
height:3em;
color:#000;
border:1px solid #fff;
border-width:1px 1px 0 0;
background:#dfc184;
padding-left:10px;
line-height:3em;
}
* html .menu ul li a, .menu ul li a:visited {
width:149px;
w\idth:139px;
}
.menu ul li ul {
display: none;
}
table {
margin:-1px;
border-collapse:collapse;
font-size:1em;
}

/* specific to non IE browsers */
.menu ul li:hover a {
color:#fff;
background:#bd8d5e;
}
.menu ul li:hover ul {
display:block;
position:absolute;
top:3em;
margin-top:1px;
left:0;
width:150px;
}
.menu ul li:hover ul li ul {
display: none;
}
.menu ul li:hover ul li a {
display:block;
background:#faeec7;
color:#000;
height:auto;
line-height:1.2em;
padding:5px 10px;
width:129px
}
.menu ul li:hover ul li a.drop {
background:#c9c9a7;
}
.menu ul li:hover ul li a:hover {
background:#c9c9a7;
color:#000;
}
.menu ul li:hover ul li:hover ul {
display:block;
position:absolute;
left:150px;
top:0;
width:150px;
}
.menu ul li:hover ul li:hover ul.left {
left:-150px;
}
</style>
<!--[if lte IE 6]>
<style type=\"text/css\">
.menu ul li a:hover {
color:#fff;
background:#bd8d5e;
}
.menu ul li a:hover ul {
display:block;
position:absolute;
top:3em;
left:0;
background:#fff;
margin-top:0;
marg\in-top:1px;
}
.menu ul li a:hover ul li a {
display:block;
background:#dbe4ab;
color:#000;
height:auto;
line-height:1.5em;
padding:5px 10px;
width:150px;
w\idth:129px;
}
.menu ul li a:hover ul li a.drop {
background:#c9c9a7;
}
.menu ul li a:hover ul li a ul {
visibility:hidden;
position:absolute;
height:0;
width:0;
}
.menu ul li a:hover ul li a:hover {
background:#c9c9a7; color:#000;
}
.menu ul li a:hover ul li a:hover ul {
visibility:visible;
position:absolute;
top:0;
color:#000;
left:150px;
}
.menu ul li a:hover ul li a:hover ul.left {
left:-150px;
}

</style>
<![endif]-->

<div class=\"menu\">
<ul>
<li><a class=\"drop\" href=\"http://www.21shipin.com/\">DEMOS
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul>
<li><a href=\"http://www.21shipin.com/\" title=\"The zero dollar ads page\">zero dollars advertising page</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Wrapping text around images\">wrapping text around images</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Styling forms\">styled form</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Removing active/focus borders\">active focus</a></li>
<li><a class=\"drop\" href=\"http://www.21shipin.com/\" title=\"Hover/click with no active/focus borders\">hover/click with no borders
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul>
<li><a href=\"http://www.21shipin.com/\" title=\"Styling forms\">styled form</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Removing active/focus borders\">removing active/focus borders</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Hover/click with no active/focus borders\">hover/click</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->
</li>
<li class=\"upone\"><a href=\"http://www.21shipin.com/\" title=\"Multi-position drop shadow\">shadow boxing</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Image Map for detailed information\">image map for detailed information</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"fun with background images\">fun with background images</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"fade-out scrolling\">fade scrolling</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"em size images compared\">em image sizes compared</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->
</li>
<li><a href=\"http://www.21shipin.com/\">BOXES
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul>
<li><a href=\"http://www.21shipin.com/\" title=\"a coded list of spies\">a coded list of spies</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"a horizontal vertical menu\">vertical menu</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"an enlarging unordered list\">enlarging unordered list</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"an unordered list with link images\">link images</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"non-rectangular links\">non-rectangular</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"jigsaw links\">jigsaw links</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"circular links\">circular links</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->
</li>
<li><a href=\"http://www.21shipin.com/\">MOZILLA
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul>
<li><a href=\"http://www.21shipin.com/\" title=\"A drop down menu\">drop down menu</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"A cascading menu\">cascading menu</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Using content:\">content:</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\":hover applied to a div\">mozzie box</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"I can build a rainbow\">I can build a rainbow with transparent borders</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Snooker cue\">a snooker cue using border art</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Target Practise\">target practise</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Two tone headings\">two tone headings</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Shadow text\">shadow text</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->
</li>
<li><a href=\"http://www.21shipin.com/\">EXPLORER
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul>
<li><a href=\"http://www.21shipin.com/\" title=\"Example one\">the first example for Internet Explorer</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Weft fonts\">weft fonts</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Vertical align\">vertically aligning text</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->
</li>
<li><a href=\"http://www.21shipin.com/\">OPACITY
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul>
<li><a href=\"http://www.21shipin.com/\" title=\"colour wheel\">a colour wheel using opaque colours</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"a menu using opacity\">a menu using opacity</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"partial opacity\">partial opacity</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"partial opacity II\">partial opacity II</a></li>
<li><a class=\"drop\" href=\"http://www.21shipin.com/\" title=\"Hover/click with no active/focus borders\">HOVER/CLICK
<!--[if IE 7]><!-->
</a>
<!--<![endif]-->
<table><tr><td>
<ul class=\"left\">
<li><a href=\"http://www.21shipin.com/\" title=\"Styling forms\">styled form</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Removing active/focus borders\">removing active/focus borders</a></li>
<li><a href=\"http://www.21shipin.com/\" title=\"Hover/click with no active/focus borders\">hover/click</a></li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->

</li>
</ul>
</td></tr></table>
<!--[if lte IE 6]>
</a>
<![endif]-->
</li>
</ul>
</div>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>21shipin.com</title> <style type="text/css"> .menu { font-family: verdana, sans-serif; width:750px; position:relative; font-size:0.85em; padding-bottom:250px; } .menu ul { padding:0; margin:0; list-style-type: none; } .menu ul li { float:left; position:relative; } .menu ul li a, .menu ul li a:visited { display:block; text-decoration:none; color:#000; width:139px; height:3em; color:#000; border:1px solid #fff; border-width:1px 1px 0 0; background:#dfc184; padding-left:10px; line-height:3em; } * html .menu ul li a, .menu ul li a:visited { width:149px; w\idth:139px; } .menu ul li ul { display: none; } table { margin:-1px; border-collapse:collapse; font-size:1em; } /* specific to non IE browsers */ .menu ul li:hover a { color:#fff; background:#bd8d5e; } .menu ul li:hover ul { display:block; position:absolute; top:3em; margin-top:1px; left:0; width:150px; } .menu ul li:hover ul li ul { display: none; } .menu ul li:hover ul li a { display:block; background:#faeec7; color:#000; height:auto; line-height:1.2em; padding:5px 10px; width:129px } .menu ul li:hover ul li a.drop { background:#c9c9a7; } .menu ul li:hover ul li a:hover { background:#c9c9a7; color:#000; } .menu ul li:hover ul li:hover ul { display:block; position:absolute; left:150px; top:0; width:150px; } .menu ul li:hover ul li:hover ul.left { left:-150px; } </style> <style type="text/css"> .menu ul li a:hover { color:#fff; background:#bd8d5e; } .menu ul li a:hover ul { display:block; position:absolute; top:3em; left:0; background:#fff; margin-top:0; marg\in-top:1px; } .menu ul li a:hover ul li a { display:block; background:#dbe4ab; color:#000; height:auto; line-height:1.5em; padding:5px 10px; width:150px; w\idth:129px; } .menu ul li a:hover ul li a.drop { background:#c9c9a7; } .menu ul li a:hover ul li a ul { visibility:hidden; position:absolute; height:0; width:0; } .menu ul li a:hover ul li a:hover { background:#c9c9a7; color:#000; } .menu ul li a:hover ul li a:hover ul { visibility:visible; position:absolute; top:0; color:#000; left:150px; } .menu ul li a:hover ul li a:hover ul.left { left:-150px; } </style> <![endif] </head> <body> <div class="menu"> <ul> <li>DEMOS <table><tr><td> <ul> <li>zero dollars advertising page</li> <li>wrapping text around images</li> <li>styled form</li> <li>active focus</li> <li>hover/click with no borders <table><tr><td> <ul> <li>styled form</li> <li>removing active/focus borders</li> <li>hover/click</li> </ul> </td></tr></table> <![endif] </li> <li class="upone">shadow boxing</li> <li>image map for detailed information</li> <li>fun with background images</li> <li>fade scrolling</li> <li>em image sizes compared</li> </ul> </td></tr></table> <![endif] </li> <li>BOXES <table><tr><td> <ul> <li>a coded list of spies</li> <li>vertical menu</li> <li>enlarging unordered list</li> <li>link images</li> <li>non-rectangular</li> <li>jigsaw links</li> <li>circular links</li> </ul> </td></tr></table> <![endif] </li> <li>MOZILLA <table><tr><td> <ul> <li>drop down menu</li> <li>cascading menu</li> <li>content:</li> <li>mozzie box</li> <li>I can build a rainbow with transparent borders</li> <li>a snooker cue using border art</li> <li>target practise</li> <li>two tone headings</li> <li>shadow text</li> </ul> </td></tr></table> <![endif] </li> <li>EXPLORER <table><tr><td> <ul> <li>the first example for Internet Explorer</li> <li>weft fonts</li> <li>vertically aligning text</li> </ul> </td></tr></table> <![endif] </li> <li>OPACITY <table><tr><td> <ul> <li>a colour wheel using opaque colours</li> <li>a menu using opacity</li> <li>partial opacity</li> <li>partial opacity II</li> <li>HOVER/CLICK <table><tr><td> <ul class="left"> <li>styled form</li> <li>removing active/focus borders</li> <li>hover/click</li> </ul> </td></tr></table> <![endif] </li> </ul> </td></tr></table> <![endif] </li> </ul> </div> </body> </html>
[ 可先修改部分代码 再运行查看效果 ]