Firefox 3.6和Firefox 4之间的水平导航CSS差异。

<ul id=\"nav2\">
      <li><a href=\"/\" title=\"promotional products home\">home</a></li>
      <li><a href=\"/Information/Product-Testing-Library\" title=\"product safety\">product safety</a></li>
      <li><a href=\"/Current_Specials?loc=top\" title=\"current promotional product specials\">current specials</a></li>
      <li><a href=\"/Marketing-Tools/2011-Digital-Catalog-and-Request-Form\" title=\"digital and request catalog\">request catalog</a></li>
      <li><a href=\"/Marketing-Tools?loc=top\" title=\"marketing tools\">marketing tools</a></li>
      <li><a href=\"/Information/About-Us\" title=\"about us and our promotional products\">about us</a></li>
      <li><a href=\"/Contact-Us\" title=\"Contact us about our promotional products\">contact us</a></li>
    </ul>


#header_top ul#nav2 {
    margin: 0;
    padding: 0;
    list-style: none;
    position: absolute;
    top: 79px; /* was 80px ll */
    width: 900px; /* was 776 ll */
    left: 7px; /* was 64px */
    font-family: Arial, Helvetica, sans-serif;
}
#header_top ul#nav2 li {
    float: left;
    font-weight: bold;
    padding: 0 23px;
    font-size: 11px;
    list-style:none;
}
#header_top ul#nav2 li a {
    color: #fff;
    text-transform: uppercase;
}
#nav3 a, #nav3 a a:link, #nav3 a a:visited, #nav2 li a, #nav2 a a:link, #nav2 li a a:visited, #nav1 li a, #nav1 a a:link, #nav1 li a a:visited {text-decoration: none;} 

#nav3 a:hover, #nav3 a:active, #nav2 li a:hover, #nav2 li a:active, #nav1 li a:hover, #nav1 li a:active {text-decoration:underline;} /* ll */