CSS导航菜单，三级菜单实现代码

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<title>CSS导航</title>
<meta content="text/html; charset=gb2312" http-equiv="Content-Type">
<style type="text/css"> 
!-- 
body { 
font: 12px/1.6em Tahoma,Verdana; 
margin-top: 0px; 
margin-right: 0px; 
margin-bottom: 0px; 
margin-left: 0px; 
line-height: 16.8px; 
} 
#nav { 
Z-INDEX: 500; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; HEIGHT: 27px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px 
} 
#nav LI.top { 
DISPLAY: block; FLOAT: left; HEIGHT: 27px; 
} 
#nav LI A.top_link { 
PADDING-BOTTOM: 0px; LINE-HEIGHT: 27px; PADDING-LEFT: 0px; PADDING-RIGHT: 0px; DISPLAY: block; FLOAT: left; HEIGHT: 27px; FONT-SIZE: 12px; CURSOR: pointer; FONT-WEIGHT: bold; TEXT-DECORATION: none; PADDING-TOP: 0px 
} 
#nav LI A.top_link SPAN { 
PADDING-BOTTOM: 0px; WIDTH: 80px; DISPLAY: block; text-align:center; FLOAT: left; HEIGHT: 27px; PADDING-TOP: 0px 
} 
#nav LI A.top_link SPAN.down { 
PADDING-BOTTOM: 0px; WIDTH: 80px; DISPLAY: block; text-align:center; BACKGROUND: url(/upload/201011/20101102232944735.gif) no-repeat right; FLOAT: left; HEIGHT: 27px; PADDING-TOP: 0px 
} 
#nav LI:hover A.top_link { 
background-color:#548bcf; color:#fff2ee; 
} 
#nav LI:hover A.top_link SPAN { 
background-color:#548bcf; color:#fff2ee; 
} 
#nav LI:hover A.top_link SPAN.down { 
background-color:#548bcf; color:#fff2ee;BACKGROUND: url(/upload/201011/20101102232944294.gif) no-repeat right; 
} 
#nav LI:hover { 
Z-INDEX: 200; POSITION: relative 
} 
#nav LI:hover UL.sub { 
Z-INDEX: 270; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: 27px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 1px 
} 
#nav LI:hover UL.sub LI { 
POSITION: relative; WIDTH: 150px; DISPLAY: block; FLOAT: left; HEIGHT: 19px; FONT-WEIGHT: normal 
} 
#nav LI:hover UL.sub LI A { 
BORDER-BOTTOM: 0px; BORDER-LEFT: 0px; LINE-HEIGHT: 19px; TEXT-INDENT: 5px; WIDTH: 150px; DISPLAY: block; HEIGHT: 19px; COLOR: #000; FONT-SIZE: 12px; BORDER-TOP: 0px; BORDER-RIGHT: 0px; TEXT-DECORATION: none 
} 
#nav LI UL.sub LI A.fly { 
BACKGROUND: url(/upload/201011/20101102232944264.gif) #e1ecf6 no-repeat left center 
} 
#nav LI:hover UL.sub LI A:hover { 
BACKGROUND: url(/upload/201011/20101102232944198.gif) #548bcf repeat-x center center; COLOR: #fff; 
} 
#nav LI:hover UL.sub LI A.fly:hover { 
BACKGROUND: url(/upload/201011/20101102232944875.gif) #548bcf no-repeat left center; COLOR: #fff 
} 
#nav LI:hover LI:hover UL { 
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px 
} 
#nav LI:hover LI:hover LI:hover UL { 
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px 
} 
#nav LI:hover LI:hover LI:hover LI:hover UL { 
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px 
} 
#nav LI:hover LI:hover LI:hover LI:hover LI:hover UL { 
Z-INDEX: 400; BORDER-BOTTOM: #ddd 1px solid; BORDER-LEFT: #ddd 1px solid; PADDING-BOTTOM: 0px; PADDING-LEFT: 0px; WIDTH: 150px; PADDING-RIGHT: 0px; WHITE-SPACE: nowrap; BACKGROUND: #e1ecf6; HEIGHT: auto; BORDER-TOP: #ddd 1px solid; TOP: -1px; BORDER-RIGHT: #ddd 1px solid; PADDING-TOP: 0px; LEFT: 144px 
} 
#nav UL { 
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px 
} 
#nav LI:hover UL UL { 
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px 
} 
#nav LI:hover LI:hover UL UL { 
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px 
} 
#nav LI:hover LI:hover LI:hover UL UL { 
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px 
} 
#nav LI:hover LI:hover LI:hover LI:hover UL UL { 
POSITION: absolute; PADDING-BOTTOM: 0px; LIST-STYLE-TYPE: none; MARGIN: 0px; PADDING-LEFT: 0px; WIDTH: 0px; PADDING-RIGHT: 0px; HEIGHT: 0px; TOP: -9999px; LIST-STYLE-IMAGE: none; PADDING-TOP: 0px; LEFT: -9999px 
} 
#nav LI:hover LI:hover A.fly { 
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/upload/201011/20101102232944875.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff; 
} 
#nav LI:hover LI:hover LI:hover A.fly { 
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/upload/201011/20101102232944875.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff; 
} 
#nav LI:hover LI:hover LI:hover LI:hover A.fly { 
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/upload/201011/20101102232944875.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff; 
} 
#nav LI:hover LI:hover LI:hover LI:hover LI:hover A.fly { 
BORDER-BOTTOM-COLOR: #fff; BORDER-TOP-COLOR: #fff; BACKGROUND: url(/upload/201011/20101102232944875.gif) #548bcf no-repeat left center; COLOR: #fff; BORDER-RIGHT-COLOR: #fff; BORDER-LEFT-COLOR: #fff; 
} 
#nav LI:hover LI:hover LI A.fly { 
BORDER-BOTTOM-COLOR: #e1ecf6; BORDER-TOP-COLOR: #e1ecf6; BACKGROUND: url(/upload/201011/20101102232944264.gif) #e1ecf6 no-repeat left center; COLOR: #000; BORDER-RIGHT-COLOR: #e1ecf6; BORDER-LEFT-COLOR: #e1ecf6 
} 
#nav LI:hover LI:hover LI:hover LI A.fly { 
BORDER-BOTTOM-COLOR: #e1ecf6; BORDER-TOP-COLOR: #e1ecf6; BACKGROUND: url(/upload/201011/20101102232944264.gif) #e1ecf6 no-repeat left center; COLOR: #000; BORDER-RIGHT-COLOR: #e1ecf6; BORDER-LEFT-COLOR: #e1ecf6 
} 
#nav LI:hover LI:hover LI:hover LI:hover LI A.fly { 
BORDER-BOTTOM-COLOR: #e1ecf6; BORDER-TOP-COLOR: #e1ecf6; BACKGROUND: url(/upload/201011/20101102232944264.gif) #e1ecf6 no-repeat left center; COLOR: #000; BORDER-RIGHT-COLOR: #e1ecf6; BORDER-LEFT-COLOR: #e1ecf6 
} 
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