[Zope] Creating a DTM Document in a variable folder.

Hello, I don't have any Python experience yet, so who has a solution for this 'problem'. Example: I 've 3 folders a, b & c. I want to create a dtml document in a folder by a form. The folder is a variable in my form. The formis no problem, the form action is no problem. The python script to craete that document is my problem. How can I create a DTM Document in a variable container ? Regards, Martin Koekenberg