I got a reallly simple drop-down menu but got a problem with the submenus width.
See it here: http://dl.dropbox.com/u/70953/SOSfrontpage.html
My HTML is:
<div id="navigation">
<div id="menu-dropdown">
    <ul class="menu">
     <li class="menu_punkt"><a href="http://itu.dk/people/lfel/Web-kodning/SOSfrontpage.html">Frontpage</a></li>
        <li class="menu_punkt"><a href="http://itu.dk/hvem_er_vi_menu/hvem_er_vi.html">Who are we?</a></li>
     <li class="menu_punkt"><a href="http://itu.dk/oplev_sos_menu/oplev_sos.html">This is a test</a>
           <ul>
                    <li><a href="http://itu.dk/people/lfel/Web-kodning/xxx.html">Your profile</a></li>
        <li><a href="http://itu.dk/people/lfel/Web-kodning/xxx.html">New profile</a></li>
       </ul>
        </li>
     <li class="menu_punkt"><a href="http://itu.dk/sos_profil_menu/sos_profil.html">SOS Profile</a>
       <ul>
                    <li><a href="http://itu.dk/people/lfel/Web-kodning/din_profil.html">Your profile</a></li>
        <li><a href="http://itu.dk/people/lfel/Web-kodning/ny_bruger.html">New user</a></li>
       </ul>
           </li><li class="menu_punkt"><a href="http://itu.dk/log_ind.html">Log ind</a></li>     
</ul>
</div>
  </div>
and my CSS is:
/*horisontal navbar*/
#menu-dropdown {
    list-style: none;
    position: absolute;
    top: 600px;
}
#menu-dropdown ul li {
    float:left;
    list-style-type: none;
    font-size: 0.8em;
}
#menu-dropdown li ul {
    position: absolute;
    display: none;
    background-color:#cdc3a2;
    padding: 0px;
    margin-bottom:1px;
}
#menu-dropdown ul ul li {
    clear: both; 
}
#menu-dropdown ul li a {
    display: block;
    padding: 10px;
    color:#102B47;
    text-decoration:none;
    font-family:Verdana, Geneva, sans-serif;
    font-size: 1em;
}
#menu-dropdown ul li a:hover {
    background-color: #cdc3a2;
}
#menu-dropdown li:hover ul, li.over ul {
    display: block;
}
You can see my problem here: http://dl.dropbox.com/u/70953/SOSfrontpage.html
Regards - Mestika