There may be other errors, but looking at the markup of your menu, it's missing the markup for the two drop down menus themselves that are specified:
Code:
<div id="indexdropdowntabs" class="slidingdoors">
<ul>
<li><a href="http://www.dynamicdrive.com">Home</a></li>
<li><a href="http://www.dynamicdrive.com/style/" rel="dropmenu1">CSS</a></li>
<li><a href="http://www.dynamicdrive.com/resources/" rel="dropmenu2">Partners</a></li>
<li><a href="http://tools.dynamicdrive.com">Tools</a></li>
</ul>
</div>
The missing markup should look something like this:
Code:
<!--1st drop down menu -->
<div id="dropmenu1" class="dropmenudiv_c">
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C1/">Horizontal CSS Menus</a>
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C2/">Vertical CSS Menus</a>
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C4/">Image CSS</a>
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C6/">Form CSS</a>
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C5/">DIVs and containers</a>
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C7/">Links and Buttons</a>
<a href="http://www.dynamicdrive.com/style/csslibrary/category/C8/">Other</a>
</div>
<!--2nd drop down menu -->
<div id="dropmenu2" class="dropmenudiv_c" style="width: 150px;">
<a href="http://www.cssdrive.com">CSS Drive</a>
<a href="http://www.javascriptkit.com">JavaScript Kit</a>
<a href="http://www.codingforums.com">Coding Forums</a>
<a href="http://www.javascriptkit.com/jsref/">JavaScript Reference</a>
</div>
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