Limit file field on publish tab to specific directory.

Hi Guys,

I have a custom module, and I need to add an upload field to our module tab.

In actual fact, I have the file field working already, and its uploading, and its saving the file location as it should be.

I do however, need to limit the file field to upload to a specific directory that is set up in file upload preferences. Was looking around for something that might give me an indication on how I need to set this up, but have not had much luck.

Hoped someone might be able to point me in the right direction.