eval in smarty

Hi, I'm Wiwid, new member on here.

I have the problem about eval function on smarty. Maybe someone can help me? 
OK, I explain the code:

************************************************************************
english.conf:
************************************************************************
register = "Register"
username = "Username"
password = "Password"
password_confirm = "Password Confirmation"
submit = "Submit"

register_success = "Registration success"
inputs_empty = "Please fill all the fields"
password_not_match = "Password and password confirmation not match"

************************************************************************
function.php:
************************************************************************
class Customer {

function register() {

if(!empty($_POST['username_register']) &&
!empty($_POST['password_register']) &&
!empty($_POST['password2_register']) && ($_POST['password_register'] ==
$_POST['password2_register'])) {

$command = "INSERT INTO `customer` SET `username` =
'".$_POST['username_register']."', `password` =
MD5('".$_POST['password_register']."')";
$query = mysql_query($command)
or die("Can't insert registration data : " . mysql_error());

$message = "#register_success#";

} else if($_POST['password_register'] != $_POST['password2_register']) {

$message = "#password_not_match#";

} else {

$message = "#inputs_empty#";

}

return $message;

}

}

************************************************************************
register.php:
************************************************************************
require_once("config.php"); // assumed database already connected from 
config.php
require_once("function.php");

$smarty->config_load("english.conf");

$customer = new Customer;

if(isset($_POST['username_register'])) {

$message = $customer->register();
$smarty->assign("message", $message);

}

************************************************************************
register.tpl:
************************************************************************
{if $smarty.post.username_register != ""}

<table border="1" width="390">
<tr>
<td align="left" colspan="2">{eval var=$message}</td>
</tr>
</table>
{/if}
<table border="1" width="390">
<form action="{$smarty.server.PHP_SELF}" method="post">
<tr>
<td align="left" colspan="2">{#register#}</td>
</tr>
<tr>
<td align="left">{#username#}</td>
<td align="left"><input type="text" name="username_register"
value="{$smarty.post.username_register}" /></td>
</tr>
<tr>
<td align="left">{#password#}</td>
<td align="left"><input type="password" name="password_register" /></td>
</tr>
<tr>
<td align="left">{#password_confirm#}</td>
<td align="left"><input type="password" name="password2_register"
/></td>
</tr>
<tr>
<td align="right" colspan="2"><input type="submit" name="submit"
value="{#submit#}" /></td>
</tr>
</form>
    </table>
*************************************************************************

When register.php run, I want the "message" text appear with one of these 
text:

Registration success
Please fill all the fields
Password and password confirmation not match

But I find the text appear as one of these:

#register_success#
#inputs_empty#
#password_not_match#

That's it.
Thank you for help me.

LuckyGuy354
IT Beginner

http://www.wiwid.org