[Radiant] Drop down menus?

[pixelnate at gmail.com]

I am new to Radiant and using radiant tags, and I am having trouble
finding a solution for drop-down menus using r:navigation. What I want
to do is this, similar to the "suckerfish dropdowns" from alistapart.com
(http://www.alistapart.com/articles/dropdowns) :

<ul>
	<li>Menu Item 1</li>
		<ul>
			 <li>Sub Menu Item 1</li>
			<li>Sub Menu Item 2</li>
			<li>Sub Menu Item 3</li>
		</ul>
	<li>Menu Item 2</li>
	<li>Menu Item 3</li>
</ul>

Are there any facilities for this in r:navigation or do I need to cobble
this together by hand? Thanks in advance.


~Nate