Crée un menu dynamique Css

* Menu Superieur */
/*                */

#top-menu {
width: 907px;
height: 45px;
text-align: center;
}
#top-menu dl {
width: 896px;
margin: auto;
}
#top-menu dd {
width: 128px;
height: 23px;
font-family: Arial, Helvetica, sans-serif; 
text-align: center;
background-image: url("../images/off.jpg");
background-repeat: no-repeat;
background-position: left top;
display: inline;
float: left;
margin: 0;
}
#top-menu a:link, #top-menu a:visited {
width: 128px;
height: 23px;
line-height: 20px;
display: block;
color: #3d3d3d;
font-weight: bold;
background-color: transparent;
text-decoration: none;
}
#top-menu a:active, #top-menu a:hover, #top-menu #on {
width: 128px;
height: 41px;
line-height: 35px;
display: block;
color: white;
text-decoration: none;
background-image: url("../images/on.jpg");
background-repeat: no-repeat;
background-position: left top;

 <!-- Menu Supérieur -->
      <div id="top-menu">
        <dl>
          <dd><a href="index.html" title="Accueil" id="on">Accueil</a></dd>
          <dd><a href="http://www.lgh-serveur.com/larp/forum" title="Accueil" id="off">Forum</a></dd>
          <dd><a href="staff.html" title="Accueil" id="off">Staff</a></dd>

          <dd><a href="contact.html" title="Accueil" id="off">Contact</a></dd>

        </dl>
      </div>