well, I see several problems. First, the actual menus seem to be positioned beneath (as near as I can tell - disable css styles and you'll see all the things that are stacked up) the images you use to make your menu buttons. That seems the most likely reason the drop-downs don't work, but I couldn't say for sure without testing.
A more pressing issue seems to be:
Code:
font face="tahoma"> <li><a href="http://www.dynamicdrive.com/">Narnia Avatars</a></li>
<li><a href="http://www.cssdrive.com">Non-Narnia Avatars</a></li>
<li><a href="http://www.javascriptkit.com">Bases</a></li>
<li><a href="http://www.codingforums.com">Blends</a></li>
<li><a href="http://www.javascriptkit.com/domref/">Wallpapers</a><a></a></li>
<a> </a></font></ul>
...all the menus are similar. You've changed the display text, but not the targets of the links: they all use the href attributes from the demo. So, even if your drop-downs worked, they wouldn't navigate your site, they'd send the visitor to DD or codingforums or wherever. There are extra <a> and miscellaneous other tags as well.
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