[轉貼自]http://qrayg.com/experiment/cssmenus/
/*
Author: Craig Erskine
Description: Dynamic Menu System - Vertical
*/
ul#navmenu-v,ul#navmenu-v li,ul#navmenu-v ul {
width: 160px; /* Menu Width */
margin: 0;
list-style: none;
}
ul#navmenu-v li { float: left; position: relative; width: 100%; }
ul#navmenu-v li.iehover { z-index: 1000; /* IE z-index bugfix */ }
ul#navmenu-v ul {
display: none;
position: absolute;
top: 0;
left: 100%;
z-index: 9999;
}
/* Root Menu */
ul#navmenu-v a {
border-top: 1px solid #FFF;
border-right: 1px solid #FFF;
padding: 6px;
display: block;
background: #DDD;
color: #666;
font: bold 11px Arial, sans-serif;
text-decoration: none;
height: 1%;
}
/* Root Menu Hover Persistence */
ul#navmenu-v a:hover,ul#navmenu-v li:hover a,ul#navmenu-v li.iehover a {
background: #BBB;
color: #FFF;
}
/* 2nd Menu */
ul#navmenu-v li:hover li a,ul#navmenu-v li.iehover li a {
float: none;
background: #BBB;
}
/* 2nd Menu Hover Persistence */
ul#navmenu-v li:hover li a:hover,ul#navmenu-v li:hover li:hover a,ul#navmenu-v li.iehover li a:hover,ul#navmenu-v li.iehover li.iehover a {
background: #999;
}
/* 3rd Menu */
ul#navmenu-v li:hover li:hover li a,ul#navmenu-v li.iehover li.iehover li a {
background: #999;
}
/* 3rd Menu Hover Persistence */
ul#navmenu-v li:hover li:hover li a:hover,ul#navmenu-v li:hover li:hover li:hover a,ul#navmenu-v li.iehover li.iehover li a:hover,ul#navmenu-v li.iehover li.iehover li.iehover a {
background: #666;
}
/* 4th Menu */
ul#navmenu-v li:hover li:hover li:hover li a,ul#navmenu-v li.iehover li.iehover li.iehover li a {
background: #666;
}
/* 4th Menu Hover */
ul#navmenu-v li:hover li:hover li:hover li a:hover,ul#navmenu-v li.iehover li.iehover li.iehover li a:hover {
background: #333;
}
/* Hover Function - Do Not Move */
ul#navmenu-v li:hover ul ul,ul#navmenu-v li:hover ul ul ul,ul#navmenu-v li.iehover ul ul,ul#navmenu-v li.iehover ul ul ul { display: none; }
ul#navmenu-v li:hover ul,ul#navmenu-v ul li:hover ul,ul#navmenu-v ul ul li:hover ul,ul#navmenu-v li.iehover ul,ul#navmenu-v ul li.iehover ul,ul#navmenu-v ul ul li.iehover ul { display: block; }
View the JavaScript (for IE)