[jQuery] nth-of-type() not working?

[jQuery] nth-of-type() not working?

Hello there.
I've been using the :nth-child(even) CSS selector with success (eg.
$('#primary li:nth-child(even)')), but when I came to use nth-of-type
jQuery doesn't seem to want to play ball with the odd/even keywords.
I've created a test case at http://tinyurl.com/em6j3. If you view the
source of that document you'll see I've used $('p:nth-of-type(odd)') but
it isn't working, while $('p:nth-of-type(3)') works just fine.
According to
http://www.w3.org/TR/2005/WD-css3-selectors-20051215/#nth-of-type-pseudo
I should be able to use the even and odd values.
Is this a problem with jQuery, or with my understanding of how
nth-of-type should behave?
Best wishes,
Dave Cardwell.
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