How to set password description separately?

hi,

I am trying to write a user registration module. Here is some code in the registerme.module file:

function registerme_user($op, &$edit, &$account, $category = NULL) {
global $min_len, $max_len, $min_pass;
switch ($op) {
case 'register': // user is registering
$form = array();

// Add the original registration form elements to this customized form
$form = array_merge($form, user_edit_form(NULL, NULL, TRUE) ); //$uid=null, $edit=null, $register=true

$form['account']['pass'] = array(
'#type' => 'password_confirm',
'#description' => t('Provide a password for the new account in both fields. '),
'#required' => TRUE,
'#size' => 30,
);

$form['account']['name']['#description'] = "Enter a user name that starts with a letter. It must be between $min_len and $max_len characters in length. Only letters, numbers, and underscores are allowed.";
$form['account']['mail']['#description'] = "Enter a valid email address. The email is not made public. ";

unset($form['account']['pass']['#description']);
$form['account']['pass']['pass1']['#description'] = "Create a password for your account. The password must be between $min_pass and $max_len characters in length.";
$form['account']['pass']['pass2']['#description'] = 'Retype the password above';

return $form;
} //end of switch
} //end of hook_user

The problem is I want to set the description for "password" and "confirm password" fields separately. My code does not work. Any help is appreciated. Thanks

Gloria