/*debut du menu a onglet 2009*/
.images {background:#c00; width:20px; padding:1px;} /* not part of the menu */
#nav ul {margin:0 auto; padding:0; list-style:none; display:table; white-space:nowrap; font-family: arial, verdana, sans-serif; font-size:11px;}
#nav li {display:table-cell; margin:0; padding:0;}
#nav a {float:left; color:#431313; background: #fafbbf url(/becv3/menu/images/top_left.gif) no-repeat left top; margin:0 4px 0 0; padding:0 0 0 2px; text-decoration:none; letter-spacing:0px;}
#nav a b {float:left; display:block; background:transparent url(/becv3/menu/images/top_right.gif) no-repeat right top; padding:0px 8px 10px 0px;}
#nav a:hover {background: #292929 url(/becv3/menu/images/top_left.gif) no-repeat left top; color:#fff; cursor:pointer;} 
#nav .current a {background: #292929 url(/becv3/menu/images/top_left.gif) no-repeat left top; color:#fff; cursor:default;} 
#nav {padding:2px 0 10px 0; background:#fff url(/becv3/menu/images/shade_bottom.gif) repeat-x left bottom; margin:0px 1px 2px 0px;} /* margin for this demo only */
<!--[if IE]>
/*#nav ul {display:inline-block;}*/
#nav ul {display:inline;}
#nav ul li {float:left;}
#nav {text-align:center; url(/becv3/menu/images/shade_bottom.gif) repeat-x left bottom;}
/*fin du menu a onglet 2009*/

<!--debut css sous/menu horizontal-->
dl#theme dt {
  display:none;
  }
dl#theme dd {
  padding:0; 
  margin:0;
  }
a.title {
  	display:block; 
  	width:100;
  	height:28;
	background-image:url(/becv3/menu/images/boutonmenu.gif);
	float:left;
	}
a.xmenu, a.xmenu:visited {
  display:block; 
  width:105; 
  height:28; 
  background:#292929; 
  text-decoration:none; 
  text-align:center; 
  color:#aaa; 
  float:left;
  }
a.xmenu span, a.xmenu:visited span {
  display:block; 
  width:75; 
  height:0.5em; 
  border-top:0.5em solid #292929; 
  border-left:1em solid #292929;  
  border-right:1em solid #292929; 
  border-bottom:0.5em solid #292929; 
  background:#bd4c4c; 
  overflow:hidden;
  }
* html a.xmenu span, * html a.xmenu:visited span {
  width:75; 
  height:1.5em; 
  w\idth:3em; 
  he\ight:0.5em; 
  overflow:hidden;
  }
a.xmenu:hover {
  color:#ff0;
  }
a.xmenu:hover span {
  background:#0f0;
  }
<!--fin css sous-menu horizontal-->