这是一款酷黑的圆角多级下滑菜单，可支持三级，鼠标放上后可见到滑出的菜单，调用了一个JS封装库，代码有些复杂，有兴趣的可研究。
运行效果截图如下：
在线演示地址如下：
具体代码如下：
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ulm_round_corner_size_sub = 2; </script> <div><style type="text/css">.imgl .imrc{font-size:1px;line-height:0px;height:1px;border-width:0px;border-style:solid;border-right-width:1px;border-left-width:1px;}.imgl .imbrc{border-width:0px;border-bottom-width:1px;height:0px;}</style></div><!--[if lte IE 6]><style type="text/css">.imgl .imrc{overflow:hidden;}.imgl .imroundcorner{height:1px;}</style><![endif]--><!--[if gte IE 7]><style type="text/css">.imgl .imroundcorner{zoom:1;}</style><![endif]--><script language="JavaScript" type="text/javascript">;function im_round_corners(tb,ms,isget,inner){var size=window["ulm_round_corner_size_"+ms];var pos=0;var wv="";if(!inner)wv+='<div imrctype="'+tb+'" imrcgroup="'+ms+'">';if(tb=="top"){wv+=im_rcs(size,1," imtopspace");for(var i=size-1;i>=0;i--)wv+=im_rcs(i);}else {for(var i=0;i<size;i++)wv+=im_rcs(i);wv+=im_rcs(size,1,"");}if(!inner)wv+='</div>';if(isget)return wv;else document.write(wv);};function im_rcs(pos,is_cap,topclass){if(is_cap)return '<div></div>';else return '<div></div>';}</script> <!--end--> <!--[imstyles] *** Infinite Menu Styles: Keep this section in the document head for full validation. --> <style type="text/css"> /* --[[ Main Expand Icons ]]-- */ #imenus0 .imeam span,#imenus0 .imeamj span {width:9px; height:9px; left:-10px; top:5px; background-repeat:no-repeat;background-position:top left;} #imenus0 li:hover .imeam span,#imenus0 li a.iactive .imeamj span {background-repeat:no-repeat;background-position:top left;} /* --[[ Sub Expand Icons ]]-- */ #imenus0 ul .imeas span,#imenus0 ul .imeasj span {background-image:url(images/small_red_pointer.gif); width:7px; height:8px; left:-8px; top:3px; background-repeat:no-repeat;background-position:top left;} #imenus0 ul li:hover .imeas span,#imenus0 ul li a.iactive .imeasj span {background-image:url(images/small_red_pointer.gif); background-repeat:no-repeat;background-position:top left;} /* --[[ Main Container ]]-- */ #imouter0 {background-color:#546347; border-style:solid; border-color:#000000; border-width:0px 1px; padding:0px 2px; margin:0px; } /* [Rounded Corner Styles] */ .imrcmain0 .imrcolor {background-color:#546347; } .imrcmain0 .imrbcolor {border-color:#444444; } .imrcmain0 .imtopspace {height:0px; } /* --[[ Sub Container ]]-- */ #imenus0 li ul {background-color:#cce7bc; 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} /* [hover] - These settings must be duplicated for IE comptatibility.*/ #imenus0 ul li:hover>a {background-color:transparent; color:#cc0000; } #imenus0 ul li a.ihover {background-color:transparent; color:#cc0000; } /* [active] */ #imenus0 ul li a.iactive {background-color:#ffffff; } /* [Dividers] */ #imenus0 .dvs {border-bottom-width:1px; border-style:dotted; border-color:#546347; padding-bottom:4px; margin-bottom:4px; } </style><!--end--> </head> <body> <!--|**START IMENUS**|imenus0,inline--> <!-- ****** Infinite Menus Structure & Links ***** --> <div><script language="JavaScript" type="text/javascript">im_round_corners("top","main");</script><div><ul> <li><a href="#"><span><span></span></span>Who We Are</a> <div><div><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul> <li><a href="#">Overview</a></li> <li><a href="#">Mission & Goals</a></li> <li><a href="#">History</a></li> <li><a href="#">Management</a></li> <li><a href="#">Working at Tyco</a></li> <li><a href="#">Press Center</a></li> <li><a href="#"><span><span></span></span>Board of Directors</a> <div><div><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul> <li><a href="#">Overview</a></li> <li><a href="#">Electronics</a></li> <li><a href="#">Fire & Security</a></li> <li><a href="#">Healthcare</a></li> <li><a href="#">Plastics & Adhesives</a></li> <li><a href="#">Engineered Producs</a></li> <li><a href="#">Tyco Worldwide</a></li> </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li> <li><a href="#"><span><span></span></span>Worldwide</a> <div><div><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul> <li><a href="#">Europe</a></li> <li><a href="#">Asia</a></li> <li><a href="#">US & Canada</a></li> <li><a href="#">Mexico</a></li> <li><a href="#">Australia</a></li> <li><a href="#">Middle East</a></li> </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li> <li><a href="#">Customers</a></li> </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li> <li><a href="#"><span><span></span></span>Our Commitment</a> <div><div><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul> <li><a href="#">Overview</a></li> <li><a href="#">People & Values</a></li> <li><a href="#">Governance</a></li> <li><a href="#">Community</a></li> <li><a href="#">Environmental</a></li> </ul><script language="JavaScript" type="text/javascript">im_round_corners("bottom","sub");</script></div></div></li> <li><a href="#"><span><span></span></span>Our Business</a> <div><div><script language="JavaScript" type="text/javascript">im_round_corners("top","sub");</script><ul> <li><a href="#">Overview</a></li> <li><a href="#">Electronics</a></li> <li><a href="#">Fire & Security</a></li> <li><a href="#">Healthcare</a></li> <li><a href="#">Plastics</a></li> <li><a href="#">Engineered Producs</a></li> <li><a href="#">Tyco Worldwide</a></li> </ul> <script language="JavaScript" type="text/javascript"> im_round_corners("bottom","sub"); 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