#nav span {
  float: left;
  text-align: center;
  display: block;
}

#nav .ul{
  margin: 0px;
  position: relative;
  display: none;
  margin-top: 5px;
  padding-bottom: 3px;
  border: 1px solid #0099CC;
  background-color: #336699;
}

#nav span:hover div, #nav span.over div {
  display: block;
  z-index: 6000;
}

#nav .li{
  display: block;
}