[jQuery] Want the submitted data from page loaded in iframe in parent page.

[Nils]

Hi all,
         I am relatively starter in php, javascript & jquery. I have a
web page that loads a signup page from other site. What i want to do
is get the signup information entered by user in the page inside
iframe on my current page so that i can store the data in my db. The
signup form that get loaded in iframe has submit button that does the
processing of the data entered by user. So i want the data on my
parent form.
anybody can help me on this???
Thanks in advance.
Regards
Nils