You can add anything you want to your own menu, the sky is the limit! However if you are using the WordPress dropdowns plugin, you will not to have this functionality via the admin panel, you would need to hard code your menu into your theme. The latest beta version of the plugin does have this functionality built into the admin panel though.
The CSS generated on this page is intended for unordered HTML lists. So if you create a valid unordered list on your page with an id of #suckerfishnav and include the CSS generated here, the dropdown will appear on your page.
Here is an example of an unordered list which will display some top level navigation items and under products will display three items (Cars, Planes and Boats):
[code:1q8xf3qv]<ul id="suckerfishnav">
<li><a href="http://domain.com/" rel="nofollow">Home</a></li>
<li><a href="" rel="nofollow">Products</a>
<ul>
<li><a href="http://domain.com/cars/" rel="nofollow">Cars</a></li>
<li><a href="http://domain.com/planes/" rel="nofollow">Planes</a></li>
<li><a href="http://domain.com//boats/" rel="nofollow">Boats</a></li>
</ul>
</li>
<li><a href="http://domain.com/company/" rel="nofollow">Company</a></li>
<li><a href="http://domain.com/about/" rel="nofollow">About</a></li>
</ul>[/code:1q8xf3qv]