Hi Stéphanie
If I understand correctly you just have to replace $context.user in
Guillaume's code snippet with $doc.getCreator()
The document creator field contains the document's full name of the
creating user.
Hope this helps
Edo
2012/1/3 Stéphanie <stephanie.roulland(a)gmail.com>om>:
  Thank you for your response, but in fact it's a
bit more difficult I think.
 Because, I working on a form. When someone wants to complete this form, he
 has to click on a button that creates a new page and every form/pages are
 created with a default sheet. So for each new form created, I want to have
 the email address on the bottom of this page (I created a hidden part just
 for the administrators). So, I just want to get the email of each creator of
 a page.
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