一、最基本的：二级dropdown弹出菜单
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=utf-8″ />
<title>二级dropdown弹出菜单–A CROSS BROWSER DROP DOWN CASCADING VALIDATING MENU</title>
<style type=”text/css”>
/* common styling */
/* set up the overall width of the menu div, the font and the margins */
.menu {
font-family: arial, sans-serif;
width:750px;
margin:0;
margin:50px 0;
}
/* remove the bullets and set the margin and padding to zero for the unordered list */
.menu ul {
padding:0;
margin:0;
list-style-type: none;
}
/* float the list so that the items are in a line and their position relative so that the drop down list will appear in the right place underneath each list item */
.menu ul li {
float:left;
position:relative;
}
/* style the links to be 104px wide by 30px high with a top and right border 1px solid white. Set the background color and the font size. */
.menu ul li a, .menu ul li a:visited {
display:block;
text-align:center;
text-decoration:none;
width:104px;
height:30px;
color:#000;
border:1px solid #fff;
border-width:1px 1px 0 0;
background:#c9c9a7;
line-height:30px;
font-size:11px;
}
/* make the dropdown ul invisible */
.menu ul li ul {
display: none;
}
/* specific to non IE browsers */
/* set the background and foreground color of the main menu li on hover */
.menu ul li:hover a {
color:#fff;
background:#b3ab79;
}
/* make the sub menu ul visible and position it beneath the main menu list item */
.menu ul li:hover ul {
display:block;
position:absolute;
top:31px;
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