Check if folder exists, if not create it

Hi Guys,
I need to check if a folder exists and if not then create it...

not sure how to go about this

Check the LEN of the Dir and if 0 use MkDir.

For more info there's a good guide here: http://www.techonthenet.com/excel/formulas/mkdir.php

Note importance of directory structure... ie each folder in the path must exist... you can't create a sub folder in another folder if the parent folder doesn't exist either.