Please help with css dropdown menu

[pablodilo]

Hi everyone, im new to css , and first of all thanks for any of response i may have... i hope some day i can pay you back

im having problems creating a dropdown menu with css. Its a little thing i cant solve... So far my submenus dropdowns very well but the problem is that the width of the line box is too small and the word i use gets half chopped...
What i want is to expand this box so the length is adapted to the word used and to be completly read .

the main menu is formed by 4 items: one of those items is twice longer than the other so the second word goes into another row, i would like this particular item´s width to be longer and the other shorter (the 4 should be 480px width). Do i make myself clear????

Below are The HTML and CSS code im using

<div id="navMenu">

<ul>
<li><a href="#">Systeam</a>
</li>
</ul>

<ul>
<li><a href="#" class="navMenu">Consultoria Logistica</a>
<ul>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>

</ul>
</li>
</ul>

<ul>
<li><a href="#">Software</a>
<ul>
<li><a href="#">Optimizacion de Rutas</a></li>
<li><a href="#">Optimizacion de Cargas</a></li>
<li><a href="#">Optimizacion de Corte</a></li>
<li><a href="#">Mantenimiento de Flota</a></li>


</ul>
</li>
</ul>
<ul>
<li><a href="#">Clientes</a>
<ul>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>
<li><a href="#">Link</a></li>

</ul>
</li>
</ul>

<br class="clearFloat" />

</div>
</div>


AND THE CSS CODE IS :

#navMenu {
margin:0;
padding:0;
}

#navMenu ul {
margin:0;
padding:0;
line-height:30px;
}
#navMenu li {
margin:0;
padding:0;
list-style:none;
float:left;
position:relative;
width:120px;
}
#navMenu ul li a {
font-family:"Trebuchet MS", Arial, Helvetica, sans-serif;
text-align:center;
text-decoration:none;
width:100px;
height:30px;
display:block;
color:white;
background-color:#000;
border-left:1px solid #999;

}
#navMenu ul ul {
position:absolute;
visibility:hidden;
top:31px;

}

#navMenu ul li:hover ul {
visibility:visible;
}

#navMenu li:hover {
background-color:#003;

}

#navMenu ul li:hover ul li a:hover {
background:#666;

color:#CCC;
}