Deleting folders

I'm trying to delete all files and folders (names unknown) within a folder.  I can delete the files of course, but don't know how to easily delete folders (without writing recursion routines or capturing folders to an array, etc.)

I tried DirRemove(), but it deletes the folder specified as well.

How can I easily delete all the folders under a specific location?  E.g:

Top folder ---
--- Unknown folder 1
--- Unknown folder 2

Delete folders within "Top folder", but not remove "Top folder."

Thanks!