Interrelated form fields

Hi all
I have a question to make
I'm tryng to build a form using the following models:

---
in models.py

class Client(models.Model):
user = models.ForeignKey(User, verbose_name=u'associated user')
telephone = models.CharField(u'Telephone number', max_length=33,
blank=False, null=False)

class Appointment(models.Model):
client= models.ForeignKey(Client, verbose_name=u'associated
client')
date = models.DateField('Booked to', blank=False, null=False)

---

As you see, the Appointment model depends on the Client one
So, I want a form showing at first the client's select box according
to the DB records of model Client
As soon as one client is selected, I want the form to show only the
appointments booked to him

How can I make that happen?
Thanks!
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