Controller function parameter is lost

Hi,

I have a controller function, and the corresponding view, setup like this:

function changePassword($id = null)

change_password.ctp

<?php echo $form->create('User', array('action' => 'changePassword')); ?>
<?php echo $form->hidden('password'); ?>
.
. Here I add the fields for old password, new password and retype new password
.
<?php echo $form->end('Submit'); ?>

The following is the generated html (the parameter to the changePassword function is the user id, in this case 3):

<form id="UserChangePasswordForm" method="post" action="/users/changePassword/3">
<fieldset style="display:none;"><input type="hidden" name="_method" value="POST" /></fieldset>
<input type="hidden" name="data[User][password]" value="encrypted password value" id="UserPassword" />

So far so good.

The problem is that when I fill the form fields and click the Submit button,
the data is being posted to "/users/changePassword" instead of "/users/changePassword/3"

I'm writing $this->params to the FirePHP console at the top of the changePassword function and this is what I get:

When I access the page initially:

Array
(
[pass] => Array
(
[0] => 3
)
[named] => Array
(
)
[controller] => users
[action] => changePassword
[plugin] =>
[form] => Array
(
)
[url] => Array
(
[url] => users/changePassword/3
)
)

After I click on Submit:

Array
(
[pass] => Array
(
)
[named] => Array
(
)
[controller] => users
[action] => changePassword
[plugin] =>
[form] => Array
(
)
[url] => Array
(
[url] => users/changePassword
)
)

As you can see the "user id" parameter is lost.

Any ideas?

Thanks in advance.

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