JQuery Drop Down menu wont display drop downs
<p>I am using this <a href="http://www.dynamicdrive.com/dynamicindex1/ddsmoothmenu.htm" rel="nofollow">Dynamic Drive Script for a smooth drop down menu</a>.</p>

<p>My site with the menu can be seen <a href="http://dgtgroup.co.uk/ascofzco/" rel="nofollow">here</a>. (the menu is the black bar in the middle).</p>

<p>Everything works fine, except when you hover over the navigation links, the drop down menus do not appear.</p>

<p>I'm not sure what is wrong</p>

<p>Any help would be gratefully appreciated. </p>

<p>EDIT: UPDATE
This is the site I am trying to <a href="http://www.ascoengineering.co.uk/" rel="nofollow">reproduce</a>. The menus on that site appear smoothly.</p>
