超级漂亮的CSS多级透明展开菜单

答案：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml2/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>CSS透明菜单</title>
<style>
#nav {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; Z-INDEX: 100; BACKGROUND: url(/jscss/demoimg/200905/transparent.gif); PADDING-BOTTOM: 0px; MARGIN: 0px; FONT: 10px arial, verdana, sans-serif; PADDING-TOP: 0px; LIST-STYLE-TYPE: none; POSITION: relative
}
#nav UL {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; Z-INDEX: 100; BACKGROUND: url(/jscss/demoimg/200905/transparent.gif); PADDING-BOTTOM: 0px; MARGIN: 0px; FONT: 10px arial, verdana, sans-serif; PADDING-TOP: 0px; LIST-STYLE-TYPE: none; POSITION: relative
}
#nav {
	PADDING-RIGHT: 0px; PADDING-LEFT: 0px; BACKGROUND: #000; PADDING-BOTTOM: 0px; WIDTH: 740px; PADDING-TOP: 0px; HEIGHT: 23px
}
#nav TABLE {
	BORDER-COLLAPSE: collapse
}
#nav LI {
	FLOAT: left
}
#nav LI LI {
	FLOAT: none
}
#nav LI A LI {
	FLOAT: left
}
#nav LI A {
	PADDING-RIGHT: 20px; DISPLAY: block; PADDING-LEFT: 10px; FONT-WEIGHT: bold; FLOAT: left; PADDING-BOTTOM: 0px; BORDER-LEFT: #000 1px solid; COLOR: #fff; LINE-HEIGHT: 22px; PADDING-TOP: 0px; WHITE-SPACE: nowrap; HEIGHT: 23px; TEXT-DECORATION: none
}
#nav LI LI A {
	FLOAT: none; LINE-HEIGHT: 20px; HEIGHT: 21px
}
#nav LI:hover {
	Z-INDEX: 100; POSITION: relative
}
#nav A:hover {
	Z-INDEX: 100; BACKGROUND: #843; BORDER-LEFT: #843 1px solid; COLOR: #fff; POSITION: relative
}
#nav LI:hover > A {
	BACKGROUND: #843; BORDER-LEFT: #843 1px solid; COLOR: #fff
}
#nav :hover UL {
	Z-INDEX: 300; LEFT: 0px; BORDER-LEFT: #843 1px solid; TOP: 23px
}
#nav A:hover UL {
	LEFT: -1px
}
#nav UL {
	LEFT: -9999px; POSITION: absolute; TOP: -9999px
}
#nav LI:hover LI:hover > UL {
	LEFT: 0px; MARGIN-LEFT: 100%; TOP: 0px
}
#nav LI:hover > UL UL {
	LEFT: -9999px; WIDTH: auto; POSITION: absolute; TOP: -9999px
}
#nav LI:hover LI:hover > A {
	BACKGROUND: #843; BORDER-LEFT: #843 1px solid; COLOR: #fff
}
#nav LI A:hover UL LI A:hover {
	BACKGROUND: #843
}
#nav A:hover A:hover UL {
	LEFT: 100%; TOP: 0px
}
#nav A:hover A:hover A:hover UL {
	LEFT: 100%; TOP: 0px
}
#nav A:hover A:hover A:hover A:hover UL {
	LEFT: 100%; TOP: 0px
}
#nav A:hover A:hover A:hover A:hover A:hover UL {
	LEFT: 100%; TOP: 0px
}
#nav A:hover UL UL {
	LEFT: -9999px; POSITION: absolute; TOP: -9999px
}
#nav A:hover A:hover UL UL {
	LEFT: -9999px; POSITION: absolute; TOP: -9999px
}
#nav A:hover A:hover A:hover UL UL {
	LEFT: -9999px; POSITION: absolute; TOP: -9999px
}
#nav A:hover A:hover A:hover A:hover UL UL {
	LEFT: -9999px; POSITION: absolute; TOP: -9999px
}

</style>
</head>

<body>
<h2>Skeleton 2 drop down menu</h2>

<ul id="nav">
<li><a href="/jscss/">Home</a></li>
<li><a href="/jscss/">About us &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
	<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
		<li><a href="/jscss/">Who we are</a></li>
		<li><a href="/jscss/">What we do</a></li>
		<li><a href="/jscss/">Where to find us</a></li>
	</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
</li>
<li><a href="/jscss/">Products &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
	<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
	<li><a href="/jscss/">Tripods &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
		<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
			<li><a href="/jscss/">Monopods</a></li>
			<li><a href="/jscss/">Tripods</a></li>
			<li><a href="/jscss/">Adjutable head</a></li>
			<li><a href="/jscss/">Fixed</a></li>
			<li><a href="/jscss/">Flash mount</a></li>
			<li><a href="/jscss/">Floating head</a></li>
		</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
	</li>
	<li><a href="/jscss/">Films &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
		<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
			<li><a href="/jscss/">35mm</a></li>
			<li><a href="/jscss/">Color Print</a></li>
			<li><a href="/jscss/">Black and White</a></li>
			<li><a href="/jscss/">Roll</a></li>
			<li><a href="/jscss/">Color Slide</a></li>
		</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
	</li>
	<li><a href="/jscss/">Cameras &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
			<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
			<li><a href="/jscss/">Compact &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
				<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
				<li><a href="/jscss/">Canon</a></li>
				<li><a href="/jscss/">Nikon</a></li>
				<li><a href="/jscss/">Minolta</a></li>
				<li><a href="/jscss/">Pentax</a></li>
				</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
			</li>
			<li><a href="/jscss/">Digital &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
					<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
					<li><a href="/jscss/">Canon</a></li>
					<li><a href="/jscss/">Nikon &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
							<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
							<li><a href="/jscss/">Lenses &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
								<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
									<li><a href="/jscss/">Standard</a></li>
									<li><a href="/jscss/">Telephoto</a></li>
									<li><a href="/jscss/">Wide Angle</a></li>
									<li><a href="/jscss/">Fish Eye</a></li>
									<li><a href="/jscss/">Mirror</a></li>
									<li><a href="/jscss/">Macro</a></li>
								</ul><!--[if lte IE 6]></td></tr></table></a><![endif]-->
							</li>
							<li><a href="/jscss/">Speedlight</a></li>
							<li><a href="/jscss/">Coolpix &raquo;<!--[if gte IE 7]><!--></a><!--<![endif]-->
									<!--[if lte IE 6]><table><tr><td><![endif]--><ul>
									<li><a href="/jscss/">Coolpix S10</a></li>
									<l
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