problemer med at få user_id i phpnuke modul

jeg har følgende script hvor jeg ikke kan få nr fra user_id, hvad er der galt ??

<?php
if (!eregi("modules.php", $_SERVER['PHP_SELF'])) {
    die ("You can't access this file directly...");
}

require_once("mainfile.php");
$module_name = basename(dirname(__FILE__));
$index = 1;
include("header.php");
cookiedecode($user);
$username = $cookie[1];

$sql = mysql_query("SELECT * FROM nuke_users WHERE username='$username'") or die(mysql_error());
$row = mysql_fetch_array($sql);
if ($row[mailkonti] >= 5) {
    echo "<center><br><br>Du har oprettet 5 kontoer hvilket er maximum<br>du vil blive sendt tilbage";
   
} else {
echo "<br><br><center>"
."<form action=\"test.php\" method=\"get\">"
."<input type=\"text\" size=\"30\" name=\"oprettetaf\" maxlength=\"15\" class=\"input\" value=\"$user_id\">"
."<p>  Din ønskede e-mail:<br>"
."<input type=\"text\" size=\"15\" name=\"email\" maxlength=\"15\" class=\"input\">@<select name=\"domain\" size=\"1\" class=\"textarea\"><option selected>mail1.dk</option>"
."<option>mail2.dk</option></select></p>"
."<p> Password:<br>"
."<input type=\"password\" size=\"30\" name=\"password\" maxlength=\"15\" class=\"input\">"
."<p>Password Igen:<br>"
."<input type=\"password\" size=\"30\" name=\"passwordt\" maxlength=\"15\" class=\"input\"><br><br>"
."<input type=\"submit\" name=\"submit\" value=\"Opret e-mail adresse hvis ledig\" class=\"button\"><input type=\"reset\" value=\"Fortryd Indtastning\" name=\"B2\" class=\"button\">"
."</form>";
}
include("footer.php");
?>