/************* Navigation****************/
.Nav_bloc {
  position: fixed;
  width: 110px;
  height: 170px;
  text-align: center;
  background: rgba(68, 69, 100, 0.8);
  display: block;
  margin-left: -50%;
  padding: 5px;
  line-height: 24px;
  z-index: 10;
}

a.nav_liens {
  color: #F2F2F2;
  font-family: 'Megrim';
}
/*************** Navigation Fin ***********/

<td align="{MENU_POSITION}"{MENU_NOWRAP}>{GENERATED_NAV_BAR}</td>

<td><div class="Nav_bloc">
   <div id="accueil"><a href="/forum" class="nav_liens"><div alt="Accueil">Accueil</div></a></div>
    <div id="rechercher"><a href="/search" class="nav_liens"><div alt="Rechercher">Rechercher</div></a></div>
    <div id="membres"><a href="/memberlist" class="nav_liens"><div alt="Membres">Membres</div></a></div>
    <div id="groupes"><a href="/groups" class="nav_liens"><div alt="Groupes">Groupes</div></a></div>
    <div id="profil"><a href="/profile?mode=editprofile" class="nav_liens"><div alt="Profil">Profil</div></a></div>
    <!-- BEGIN switch_user_logged_in -->
  <div id="mp"><a href="/privmsg?folder=inbox" class="nav_liens"><div alt="MP" id="mpO">Messagerie</div></a></div>
   <div id="off"><a href="/login?logout" class="nav_liens"><div alt="Déconnexion">OFF</div></a></div>
      <!-- END switch_user_logged_in -->
      <!-- BEGIN switch_user_logged_out -->
 <div id="s_inscrire"><a href="/register" class="nav_liens"><div alt="S'inscrire">S'inscrire</div></a></div>
 <div  id="on"><a href="/login" class="nav_liens"><div src="http://img11.hostingpics.net/pics/225491onoff.png" alt="Connexion" >On</div></a></div>
      <!-- END switch_user_logged_out -->
 
</div>
<link href='https://fonts.googleapis.com/css?family=Megrim' rel='stylesheet' type='text/css'>
  </td>