Tynde ud i min fil

Jeg har denne fil, som jeg gerne vil fjerne ALT der har med loginsystem osv. at gøre, men den kommer bare med mange fejl når jeg prøver...
Point til den der vil fjerne det for mig (dette er nok et meget mærkeligt spørgsmål...)

Her er den:

<?PHP
require_once("./inc/functions.inc.php");
//#################
$PHP_SELF = "index.php";
error_reporting (E_ALL ^ E_NOTICE);
$cutepath                     = ".";
$config_path_image_upload    = "./images/upimages/";

$config_use_cookies        = TRUE;
$config_use_sessions    = TRUE;

//#################
$check_users = file("./inc/users.db.php");
$check_users[1] = trim($check_users[1]);
if(!$check_users[1] or $check_users[1] == "" or $check_users[0] == "not-installed" ) { require("./inc/install.mdu"); die(); }
require_once("./inc/config.php");
require_once("./skins/${config_skin}.skin.php");
if($HTTP_SERVER_VARS['QUERY_STRING'] == "debug"){ debug(); }
if($config_use_sessions){
@session_start();
@header("Cache-control: private");
}
if($action == "logout")
{
    setcookie("md5_password","");
    setcookie("username","");
    if($config_use_sessions){
        @session_destroy();
        @session_unset();
    }
    msg("info", "Logout", "You are now logged out, <a href=\"index.php\">login</a><br /><br>");
}
$is_loged_in = FALSE;
$cookie_logged = FALSE;
$session_logged = FALSE;
// Check if The User is Identified
if($config_use_cookies == TRUE){
/* Login Authorization using COOKIES */
if(isset($username))
{
    if(!isset($HTTP_COOKIE_VARS["md5_password"]))    { $cmd5_password = md5($password); }
    else                                            { $cmd5_password = $HTTP_COOKIE_VARS["md5_password"]; }
    if(check_login($username, $cmd5_password))
    {
        $cookie_logged = TRUE;
        setcookie("lastusername", $username, time()+1012324305);
        setcookie("username", $username);
        setcookie("md5_password", $cmd5_password);
    }else{
        $result = "<font color=red>Wrong username or password</font>";
        $cookie_logged = FALSE;
  }
}
/* END Login Authorization using COOKIES */
}
if($config_use_sessions == TRUE){
/* Login Authorization using SESSIONS */
    if(isset($HTTP_X_FORWARDED_FOR)){ $ip = $HTTP_X_FORWARDED_FOR; }
    elseif(isset($HTTP_CLIENT_IP))    { $ip = $HTTP_CLIENT_IP; }
    if($ip == "")                    { $ip = $REMOTE_ADDR; }
    if($ip == "")                    { $ip = "not detected";}

if($action == "dologin")
{
    $md5_password = md5($password);
    if(check_login($username, $md5_password)){
        $session_logged = TRUE;

        @session_register('username');
        @session_register('md5_password');
        @session_register('ip');

        $_SESSION['username']        = "$username";
        $_SESSION['md5_password']     = "$md5_password";
        $_SESSION['ip']                = "$ip";

    }else{
        $result = "<font color=red>Wrong username and/or password</font>";
        $session_logged = FALSE;
    }
}elseif(isset($_SESSION['username'])){ // Check the if member is using valid username/password
    if(check_login($_SESSION['username'], $_SESSION['md5_password'])){
        if($_SESSION['ip'] != $ip){ $session_logged = FALSE; $result = "The IP in the session doesn not match with your IP"; }
        else{ $session_logged = TRUE; }
    }else{
        $result = "<font color=red>Wrong username and/or password !!!</font>";
        $session_logged = FALSE;
    }
}
if(!$username){ $username = $_SESSION['username']; }
/* END Login Authorization using SESSIONS */
}
#####
if($session_logged == TRUE or $cookie_logged == TRUE){ $is_loged_in = TRUE; }
#####
// If User is Not Logged In, Display The Login Page
if($is_loged_in == FALSE)
{
    if($config_use_sessions){
        @session_destroy();
        @session_unset();
    }
    setcookie("username","");
    setcookie("password","");
    setcookie("md5_password","");
    echoheader("user","Please Login");

    echo "
    <table leftmargin=0 marginheight=0 marginwidth=0 topmargin=0 border=0 height=100% cellspacing=0>
    <form  name=login action=\"$PHP_SELF\" method=post>
      <tr>
      <td width=80>Username: </td>
      <td><input tabindex=1 type=text name=username value='$lastusername' style=\"width:134\"></td>
      </tr>
      <tr>
      <td>Password: </td>
      <td><input type=password name=password style=\"width:134\"></td>
      </tr>
      <tr>
      <td></td>
      <td ><input accesskey=\"s\" type=submit style=\"width:134; background-color: #F3F3F3;\" value='      Login...      '></td>
      </tr>
      <tr>
      <td align=center colspan=3>$result</td>
      </tr>
    <input type=hidden name=action value=dologin>
    </form>
    </table>";

  echofooter();
}
elseif($is_loged_in == TRUE)
{
// ******
// Include System Module
// ******
                            //name of mod  //access
    $system_modules = array('addnews'          => 'user',
                            'editnews'        => 'user',
                            'main'              => 'user',
                            'options'          => 'user',
                            'images'          => 'user',
                            'editusers'        => 'admin',
                            'editcomments'    => 'admin',
                            'tools'            => 'admin',
                            'ipban'            => 'admin',
                            'about'            => 'user',
                            'preview'        => 'user',
                            'categories'    => 'admin',
                            );
    if($mod == ""){ require("./inc/main.mdu"); }
    elseif( $system_modules[$mod] )
    {
        if($system_modules[$mod] == "user"){ require("./inc/". $mod . ".mdu"); }
        elseif($system_modules[$mod] == "admin" and $member_db[1] == 1){ require("./inc/". $mod . ".mdu"); }
        elseif($system_modules[$mod] == "admin" and $member_db[1] != 1){ msg("error", "Access denied", "Only admin can access this module"); exit;}
        else{ die("Module access must be set to <b>user</b> or <b>admin</b>"); }
    }
    else{ die("$mod is NOT a valid module"); }
}
?>