This is best explained with a Fiddle: <http://jsfiddle.net/hxsJx/>

I want to add a class to the nth-children of an element, but only when those children have a particular class. So in my example, only articles E and J should get the class of 'end'.

The nth-child selector seems to be ignoring the class selector, which is probably intended behaviour, but I just can't find a way around it.

Thanks for any pointers folks...