Validating only several fields in model

Hi!
I have an issue with data validation.

I have model Administrator with fields : firstname,lastname,password
In Administrator model I set validation for every field (let's say
firstname can't be empty, lastname can't be empty and password can't
be empty and can consist only letters).

I want to define function which will allow user to edit (update)
Administrator's firstname and lastname. So in my function admin_edit:

function admin_edit($id) {
if(!empty($this->data)) {
$this->Administrator->set($this->data);
if($this->Administrator->validates()) {
//updating fields in DB
} else {
$this->validateErrors($this->Administrator);
}
}
}

In my view I have a form with two text fields: firstname and lastname.
I don't want password to be upadted.
And here's the problem: when I pass variables from form to admin_edit
function, validation function validates EVERY field in model
(firstname,lastname and password). And I only "give" function two
values: firstname and lastname; so the password - $this-
>data[Administrator][passowrd] - is empty and returns false from
validation.

How can I validate only firstname and lastname fields, without
validating password?

Any help appriciated. :-)

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