#menu li {margin:0; padding:0; list-style:none;}
#menu li {display:inline-block; display:inline;}
#menu ul ul {position:absolute; left:-9999px;}
#menu ul.level1 {margin:0 auto;}
#menu ul.level1 li.level1-li {float:left; display:block; position:relative;}
#menu b {position:absolute;}
#menu a {display:block; font:normal 11px verdana,arial,sans-serif; color:#000; line-height:25px; text-
decoration:none;padding:0 20px;}
#menu ul.level1 li.level1-li a.level1-a {float:left;}
#menu ul li:hover > ul {visibility:visible; left:0; top:21px;}
#menu ul ul li:hover > ul {visibility:visible; left:100%; top:auto; margin-top:-25px; margin-left:-4px;}
html下拉菜单的制作方法
#menu li.left:hover > ul {visibility:visible; left:auto; right:0; top:25px;}
#menu li.left ul li:hover > ul {visibility:visible; left:auto; right:100%; top:auto; margin-top:-25px; margin-right:-4px;}
#menu a:hover ul {left:0; top:23px;}
#menu li.left a:hover ul {left:auto; right:-1px; top:23px;}
#menu li.left ul a {text-align:right;}
#menu a:hover a:hover ul,
#menu a:hover a:hover a:hover ul {left:100%; visibility:visible;}
#menu li.left a:hover a:hover ul,
#menu li.left a:hover a:hover a:hover ul {left:auto; right:0; visibility:visible;}
#menu a:hover ul ul,
#menu a:hover a:hover ul ul {left:-9999px;}
#menu li.left a:hover ul ul,
#menu li.left a:hover a:hover ul ul {left:-9999px;}
#menu li a.drop {background:transparent url(images/white-down.gif) no-repeat right center;}
#menu li a.fly {background:transparent url(images/white-right.gif) no-repeat right center;}
#menu li.left ul a.fly {background:transparent url(images/white-left.gif) no-repeat left center;}
#menu li a:hover,
#menu li a.fly:hover {color:#c60; background-color:#c0c0c8;}
#menu li:hover > a,
#menu ul li:hover > a.fly {color:#c60; background-color:#c0c0c8;}
#menu table {position:absolute; height:0; width:0; left:0; border-collapse:collapse; margin-top:-6px;}
#menu table table {position:absolute; left:99%; height:0; width:0; border-collapse:collapse; margin-top:-30px; margin-left:-4px;}
#menu li.left table {position:absolute; height:0; width:0; left:auto; right:0; border-collapse:collapse; margin-top:-4px;}

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