[jQuery] Add class to specific list items

[Michael Price]

Hi all,
I'm guessing this is really easy in jQuery so enlighten me - given a 
list of, say, ten items, I want to leave the top six items unstyled, but 
add a class to any below number six - in order to highlight, in this 
specific case, that only the first six items will be used, and from 
seven downwards don't count.

So that's the question - how do I add a class to the seventh and all 
further list items? And is it easy to wrap into a function? This list is 
being sorted via drag and drop so it would need to change each time.........

Regards,
Michael Price