Почему не выводится значение из бд в шаблон smarty?

function maxListUsersViwed($id) {

global $db;
$max_list_users_viewed=$db->fetchRow("select `id` from ".TABLE_AQQ." where `user_id`='$id' ORDER BY `viewed` DESC LIMIT 1");
if(!$max_list_users_viewed) return 0;
    return $max_list_users_viewed;
}

$max_list_users_viewed = $usr->maxListUsersViwed($crt_usr);
$smarty->assign("$max_list_users_viewed", $max_list_users_viewed);

<a href="{$live_site}/edit.php/id={if isset($max_list_users_viewed) && $max_list_users_viewed}{$max_list_users_viewed}{else}0{/if}">&nbsp;</a>