List Folders from ToolValidator

Hi all,

I am trying to learn how to use the ToolValidator to modify the behavior of my script parameters. I've been using the ESRI help menus and other information I've found online as a reference, but I am not having much luck with my coding.

I am simply trying to write a ToolValidator script that creates a list of file folders from a hardcoded workspace and displays them as a dropdown menu in the script parameter interface. I am trying to us os.listdir() to list the folders and then pass them to the parameter list. Can anyone recommend a better method or recommend any online references /forums with code that does something similar that I can check out?

Thanks,

Erich