#menu {
width: 7em;
}
 
#menu ul {
list-style: none;
margin: 0;
padding: 0;
}
 
#menu a, #menu h2 {
font-family: "Trebuchet MS", Verdana;
font-size: 12px;
display: block;
border-width: 0px;
border-style: solid;
border-color: #ccc #888 #555 #bbb;
margin: 0;
padding: 0px 0px;
}
 
#menu h2 {
color: #000000;
text-transform: uppercase;
}
 
#menu a {
color: #000000;
text-decoration: none;
}
 
#menu a:hover {
color: #00ff00;
}

#menu li {
position: relative;
}
 
#menu ul ul ul {
position: absolute;
top: 0;
left: 100%;
width: 100%;
}
 
div#menu ul ul ul,
div#menu ul ul li:hover ul ul
{display: none;}
 
div#menu ul ul li:hover ul,
div#menu ul ul ul li:hover ul
{display: block;}
 
 <!--[if IE]>
<style type="text/css" media="screen">
 #menu ul li {float: left; width: 100%;}
</style>
<![endif]-->
<!--[if lt IE 7]>
<style type="text/css" media="screen">
body {
behavior: url(csshover.htc);
font-size: 100%;
} 
#menu ul li {float: left; width: 100%;}
#menu ul li a {height: 1%;} 
 
#menu a, #menu h2 {
font: bold 0.9em/1.4em "Trebuchet MS", Verdana;
}