Menu desplegable 100% CSS

[Kilofafeure]

Aquí va el CSS
[HTML]
@charset "utf-8";

* {
margin:0;
outline-color:-moz-use-text-color;
outline-style:none;
outline-width:0;
padding:0;
}
#menu {
/*
font-size:0.9em;
margin:20px auto;
text-align:center;
*/
height:16px;
margin:0 20px 0 0;
padding:10px 0;
text-align:left;
}
#menu ul {
list-style-type: none;
}
#menu ul li.nivel1 {
float:left;
}
#menu ul li a {
background-color: transparent;
color: #FFFFFF;
display:block;
padding:0px;
position:relative;
text-decoration:none;
}
#menu ul li:hover {
position:relative;
}
#menu ul li a:hover, #menu ul li:hover a.nivel1 {
background-color: #111111;
color: #FFFFFF;
position:relative;
}
#menu ul li a.nivel1 {
display:block !important;
position:relative;
}
#menu ul li ul {
display:none;
}
#menu ul li a:hover ul, #menu ul li:hover ul {
display:block;
left:0;
position:absolute;
width: 150px;
}
#menu ul li ul li a {
border-top-color:#000000;
padding:0px 0px;
}
#menu ul li ul li a:hover {
border-top-color:#000000;
position:relative;
}

#mainContent {
padding: 3px 0 0 0;
margin: 0;
color:#000000;
background:#DDFFDD;
font-family: Arial,Helvetica,sans-serif;
font-size: 12pt;
}
#maincontent h1, #maincontent .componentheading {
font-family:Arial,Helvetica,sans-serif;
font-size:16pt;
height:16pt;
margin:0 0 10px;
padding:3px 0 0;
}
#maincontent h2, #maincontent .contentheading {
font-family:Arial,Helvetica,sans-serif;
font-size:16pt;
margin:0;
padding:3px 0 0;
}
#maincontent h3 {
font-size:14pt;
margin:0;
padding:3px 0 0;
}
#maincontent h4 {
font-size:12pt;
margin:0;
padding:3px 0 0;
}
.post-body div
{
text-align:center;
}
.tamanoselect10
{
width:9.9em;
padding:0px 0px 4px 0px;
}
.tamanoselect15
{
width:12.9em;
padding:0px 0px 4px 0px;
}
body
{
color: #FFFFFF;
background-color: #000000;
background-image: url(../images/fondo.gif);
font-family: Verdana,Helvetica,sans-serif;
line-height: 1.3em;
margin: 0;
padding: 0;
font-size: 10pt;
}
#container {
width: 920px;
background: #FFFFFF;
margin: 0 auto; /* los márgenes automáticos (conjuntamente con un ancho) centran la página */
border: 1px solid #000000;
text-align: left; /* esto anula text-align: center en el elemento body. */
}
#header {
background-image: url(../images/header-fondo2.gif);
height:130px;
width: 100%;
margin: 0;
padding: 0;
background-color: #ffffff;
color: #000000;
}
#flags {
position:relative; top: 5px; left: 770px;
padding:2px 0px 2px 15px;
text-align:left;
width:210px;
}
#flags ul {
margin:0;
padding:0;
}
#flags li {
display:inline;
margin:0;
padding:0;
}
#buscador {
position: relative;
left: 750px;
}
#topleftmenu
{
background-image:url(../images/topbar-left.gif);
background-position:left center;
background-repeat:no-repeat;
padding-left: 117px;
/*
height:16px;
margin:0 20px 0 0;
padding:10px 0;
text-align:right;
*/
}

#toprightmenu
{
border-left:2px solid #FFFFFF;
float:right;
font-size:10pt;
font-weight:bold;
margin:7px 0 5px 20px;
padding:0 10px 0 20px;
}
#topmenu {
background-image:url(../images/topbar-fondo.gif);
background-repeat:repeat-x;
font-family:Arial,Helvetica,sans-serif;
height:36px;
margin:0;
padding:0;
}
#topmenu .moduletable
{
display:inline;
}
#topmenu ul {
display: inline;
}
#topmenu ul li {
margin: 0;
padding: 0 0 0 20px;
display: inline;
font-size: 11pt;
font-weight: bold;
}
#topmenu form {
display: inline;
padding: 0;
margin: 0;
}
#topmenu a {
color:#FFFFFF;
text-decoration:none;
}
img {
border: 0;
}
#footer {
background-image: url(../images/footer-fondo.gif);
background-repeat: repeat-x;
background-color: #000000;
color: #FFFFFF;
font-family: Verdana,Helvetica,sans-serif;
font-size: 6px;
height: 20px;
text-align:center;
padding: 2px 10px 0 10px;
}
#footer ul {
display: inline;
}
#footer ul li {
margin: 0;
padding: 0 0 0 20px;
display: inline;
}
#footer form {
display: inline;
padding: 0;
margin: 0;
}
#footer p {
margin: 0; /* el ajuste en cero de los márgenes del primer elemento del pie evitará que puedan contraerse los márgenes (un espacio entre divs) */
padding: 10px 0; /* el relleno de este elemento creará espacio, de la misma forma que lo haría el margen, sin el problema de la contracción de márgenes */
}
#footer a {
color:#FFFFFF
}
a:link {
text-decoration:none;
color: inherit;
}
dl {
margin: 0 0 5px 0;
}
dt {
font-weight: bold;
}
dd {
margin: 0 0 0 0;
}
ul {
padding: 0 0 0 20px;
margin: 0 0 5px 0;
}
fieldset {
border: 1px solid #dddddd;
margin: 0 0 7px 0;
padding: 10px 10px;
}
p {
width: 100%;
margin: 0 0 5px 0;
}
.Button{
margin: 0;
padding: 0;
border: 0;
background-color: transparent;
}
[HTML]