interrelated fields when join

Hello to everyone,

I have one question about how i make some fields interrelated with others.What i mean;For example i want when someone select America as him country automatic open new field and ask him from what state is him.Is it possible;;; Please answer me as soon as possible!

Best Regards,

Epas

Hello you can view this extension :  http://www.boonex.com/unity/extensions/entry/Self_Manageable_Dependent_Fields

Thank you for your reply my friend.Another "free"way for this problem;;;