Login fejl i mit CMS system

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Jeg har fået oprettet et CMS system men jeg kan ikke logge ind? første gang er der ingen problemmer. Men så kommer det ellers. og jeg ved at mit password er rigtig...
min hjemmeside er www.lindrup.tk

tilføjer lige min header.php


<?
/*
-------------------------------------------------------
PHP-Fusion
-----------------------------------------------
© Nick Jones 2002-2004
http://www.digitaldominion.co.uk
nick@digitaldominion.co.uk
-----------------------------------------------
Released under the terms and conditions of the
GNU General Public License (http://gnu.org).
-------------------------------------------------------
*/
require "includes/config.php";
require "includes/classes.php";

// get the user's up address and store it in a variable.
$user_ip = getenv(REMOTE_ADDR);

// Open a connection to the database, settings for which are retrieved from includes/config.php file
dbconnect($dbhost, $dbusername, $dbpassword, $dbname);

// Get the settings from the database and store them in an array
$settings = dbarray(dbquery("SELECT * FROM ".$fusion_prefix."settings"));

// Define the language and theme paths
define("fusion_langdir", fusion_basedir."language/".$settings[language]."/");
define("fusion_themedir", fusion_basedir."themes/".$settings[theme]."/");

// Check if $download_id is set.
if (isset($download_id)) {
$result = dbquery("UPDATE ".$fusion_prefix."downloads SET download_count=download_count+1 WHERE download_id='$download_id'");
$result = dbquery("SELECT download_url FROM ".$fusion_prefix."downloads WHERE download_id='$download_id'");
$data = dbarray($result);
header ("Location: $data[download_url]");
}

// Check if $weblink_id is set.
if (isset($weblink_id)) {
$result = dbquery("UPDATE ".$fusion_prefix."weblinks SET weblink_count=weblink_count+1 WHERE weblink_id='$weblink_id'");
$result = dbquery("SELECT weblink_url FROM ".$fusion_prefix."weblinks WHERE weblink_id='$weblink_id'");
$data = dbarray($result);
header ("Location: $data[weblink_url]");
}

// Set a cookie to prevent multiple counts on the unique visit counter
if (!isset($_COOKIE['fusion_visited'])) {
$result=dbquery("UPDATE ".$fusion_prefix."settings SET counter=counter+1");
setcookie("fusion_visited", "yes", time() + 31536000, "/", "", "0");
}

// Check if the login button has been pressed
if (isset($_POST['login'])) {
$result = dbquery("SELECT * FROM ".$fusion_prefix."users WHERE user_name='".$_POST['username']."' and user_password=md5('".$_POST['password']."')");
if (dbrows($result) != 0) {
  $data = dbarray($result);
  if ($data[user_ban] != 1) {   
  setcookie("fusion_user", $data[user_id].".".$data[user_password], time() + 31536000, "/", "", "0");
  header("Location: index.php");
  } else {
  $loginerror = "This account is suspended<br><br>\n";
  }
}
}

// Check if $logout is set
if ($_REQUEST['logout'] == "yes") {
setcookie("fusion_user", "Null", time() - 7200, "/", "", "0");
setcookie("fusion_lastvisit", "", time() - 7200, "/", "", "0");
header ("Location: index.php");
}

// If value of cookie fusion_user is set, check the database and automatically log the user in
if (isset($_COOKIE['fusion_user'])) {
$logincheck = explode(".", $_COOKIE['fusion_user']);
$result = dbquery("SELECT * FROM ".$fusion_prefix."users WHERE user_id='$logincheck[0]' AND user_password='$logincheck[1]'");
if (dbrows($result) != 0) {
  $userdata = dbarray($result);
  if ($userdata[user_ban] != 1) {
  if (empty($_COOKIE['fusion_lastvisit'])) {
    setcookie("fusion_lastvisit", $userdata[user_lastvisit], time() + 3600, "/", "", "0");
    $lastvisited = $userdata[user_lastvisit];
  } else {
    $lastvisited = $_COOKIE['fusion_lastvisit'];
  }
  } else {
  setcookie("fusion_user", "Null", time() - 7200, "/", "", "0");
  setcookie("fusion_lastvisit", "", time() - 7200, "/", "", "0");
  header ("Location: index.php");
  }
} else {
  setcookie("fusion_user", "Null", time() - 7200, "/", "", "0");
  setcookie("fusion_lastvisit", "", time() - 7200, "/", "", "0");
  header ("Location: index.php");
}
} else {
$userdata = "";
}

// Initialize the secondary core functions
require "includes/classes2.php";

// Check if update_profile button in edit_profile.php is pressed
if (isset($_POST['update_profile'])) {
require "includes/update_profile.php";
}

// Check if post_shout button in shoutbox.php is pressed
if (isset($_POST['post_shout'])) {
require "includes/post_shout.php";
header ("Location: index.php");
}
?>

Håber der nogle der kan hjælpe......