body { behavior: url("csshover.htc"); }
#menu {
width: 12em;
background: #ffff;
}
#menu ul {
list-style: none;
margin: 0;
padding: 0;
}
#menu a, #menu h2 {
font: bold 11px/16px arial, helvetica, sans-serif;
display: block;
border-width: 1px;
border-style: solid;
border-color: #ccc #888 #555 #bbb;
margin: 0;
padding: 2px 3px;
}

#menu h2 {
color: #fff;
background: #000;
text-transform: uppercase;
}

#menu a {
color: #000;
background: #efefef;
text-decoration: none;
}

#menu a:hover {
color: #a00;
background: #fff;
}
#menu ul ul ul {
z-index:4;
position: absolute;
top: 0;
left: 0;
}
#menu li {z-index:5; position: relative;}

#menu ul ul ul {
z-index=5;
position: absolute;
top: 0;
left: 100%;
width: 100%;
}
div#menu ul ul ul 
{display: none;}
div#menu ul ul li:hover ul 
{z-index:6; 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%;}


</style>
<![endif]-->