deleting tables from C

["Brett Bibby" <research@...>]

Hi,
Simple question that I can't quite figure out from reading the manual.
How exactly do I delete lua tables and/or functions from C?  I know I
need to set them to nil, but I'm not sure how I get the table/function
itself rather than an element of the table and then push/set a nil into
it.
Thanks,
Brett