I have this navigation menu that is horizontal across the top of my page but I need to add a drop down list to SERVICES. It is the the only one that you willl roll over and get a list of other links below it. So far I’ve not been able to figure out how to add those other links. I’m new to CSS and I’m just not getting this to work. Any ideas of what I can do or how to do it?

<!—Navigation item—>
      <ul>
        <li>[url=“about_us.html”]About Us
        <!—[if IE 7]><!—> [/url]</li>
          <li>Services<!—[if IE 7]><!—> </li>
                                       
         
          <li>Digital Press<!—[if IE 7]><!—> </li>
          <li>Cross Media Marketing<!—[if IE 7]><!—> </li>
          <li>Wideformat<!—[if IE 7]><!—> </li>
          <li>Fulfillment<!—[if IE 7]><!—> </li>
        <li>Contact Us<!—[if IE 7]><!—> </li>
         
      </ul>             
      </div>
    </div>

The web site A List Apart has a good overview on how to do this.  Of course, when I tried to do it using their example it was alright, then when I changed it to fit my specific circumstances it didn’t work right.  But after a few tweaks it worked okay.
Here’s the article

One thing…you need to create a list within your list under services.  The css method described in the article will show you how to create block elements that will only show the sub menu when you mouse over.

Thank you so much.