Allora prova così, a me funziona con questo metodo:
codice:
div#menu ul{
  list-style-type:none; 
  text-align:right; 
  vertical-align:top;
  margin: 0px;
} 

div#menu li{
  display:inline; 
  background-color:#ffffff; 
  font-family:Verdana, Arial, Helvetica, sans-serif; 
  font-size:12px; font-weight:bold; 
  border-right:2px solid #ff9900; 
  padding:0 15px 0 15px; 
  vertical-align:top;
  margin: 0px;
}