<style>
      #navbar ul{
        display: none;
        background-color: #f90;
        position: absolute;
        top: 100%;
      }
      #navbar li:hover ul { display: block; }
      #navbar, #navbar ul{
        margin: 0;
        padding: 0;
        list-style-type: none;
      }
      #navbar {
        position:relative;
        height: 30px;
        background-color: #666;
        padding-left: 25px;
        min-width: 470px;
      }
      #navbar li {
        float: left;
        height: 100%;
      }
      #navbar li a {
        display: block;
        padding: 6px;
        width: 100px;
        color: #fff;
        text-decoration: none;
        text-align: center;
      }

      #navbar li:hover { background-color: #f90; }
      #navbar ul li:hover { background-color: #666; }
    </style>