Expand the menu background down

Testing at http://d-theme.com/forest_floor shows the menu background does not expand down for multiple primary menu rows. http://drupal.org/node/343829#comment-1293392 shows a change for Dreamy that works for Forest Floor with just a slight change. Replace:

#primary{
  display:block;
  height:28px;
  border:1px solid #7D7D7D;
  background:url('images/top-nav.png');
  font-size: 13px;
  margin:0 0 22px 0;
}

With:

#primary{
  display:block;
  /* height:28px; */
  border:1px solid #7D7D7D;
  background:url('images/top-nav.png');
  font-size: 13px;
  margin:0 0 22px 0;
}

#primary ul:after
      {
      content: ".";
      display: block;
      height: 0;
      visibility: hidden;
      clear: both;
      }