modify the welcome message for some condition

[Aldo Martinez Selleras-3]

how can i modify the welcome message for some condition!?

thks in advanced!
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[Aldo Martinez Selleras-3]

with hook_mail_alter i do this

function bmg_mail_alter(&$mailkey, &$to, &$subject, &$body, &$from,
&$headers){
                if ($mailkey == 'user-register-welcome'){
                        $body = _user_mail_text('bmg_welcome_body');
                }
}

and the message sent it's the mine, but with empty variables, why?

!username,

MUCHAS GRACIAS POR SU REGISTRO EN !site. You may now log in to
!login_uri using the following username and password:

username: !username
password: !password

the vars are empty, why??
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