<style type="text/css">
  #menu{
    font-weight:bold;
    padding:0px;
    margin:0px;
  }
  #menu li{
    background-color:#D0D0D0;
    float:left;
    list-style-type:none;
    padding-right:2ex;
    cursor:pointer;
    width:12ex;
  }
  #menu li li{
    float:none;
  }
  #menu li li a{
     text-decoration:none;
    color:black;
  }
  #menu li ul{
    display:none;
    position:absolute;
    padding:0px;
  }
  #menu li:hover ul{
    display:block;
  }
  #menu li li:hover{
    background-color:#E0E0E0;
  }
</style>