user login system for other pages too

[koelkast]

there is no lib.php in my forum directory, nor in sources or packages or somewhere else...

[Douglas]

Just the basics for you to start with.  I have that set in a lib.php file.

As I said, it's just the basics for you to start with.  You need to physically create a lib.php file.  IF you are new to PHP Development, I STRONGLY suggest that you spend some time at www.hotscripts.com downloading some of the simple PHP scripts they have there, and studying them, and spend some time in the PHP Scripting forum here, or hire someone to do this for you.

[koelkast]

Well, do you have that set up in your lib.php file?

In this sentence you suggest that there already ís a lib.php so I didn't understand what you were talking about.
AND it doesn't change anything if I name the file lib.php or huh.php or njet.php  

[koelkast]

I tried a few things again and yet it seems to work a little:

I get this warning, I don't understand why the mysql_fetch_array is not valid?
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in lib.php on line 13

When I use a new header I get this message, although there is nothing on line 13 that seems to send a header:
Warning: Cannot modify header information - headers already sent by (output started at lib.php:13) in lib.php on line 21
When I use echo instead this error dissappears but I still have that other error message  

[Douglas]

Please paste the contents of your file here.

[koelkast]

<?PHP
require('SSI.php');  
$DB[hostname] = "localhost";
$DB[username] = "user";
$DB[password] = "pwd";
$DB[dbname] = "database";
$connection = mysql_connect ($DB[hostname], $DB[username], $DB[password]) or die ("Could not connect to the server.  The following error has occurred <b>" . mysql_error() . "</b>");
$db = mysql_select_db ($DB[dbname]);

global $username, $ID_MEMBER;
if ($username == "Guest") { LogIn(); exit(); }
$query = mysql_query("select emailAddress, memberGroup from yse_members where ID_MEMBER = '$ID_MEMBER'");
$result = mysql_fetch_array ($query); list ($email, $group) = $result;
if ($group == "Banned") { echo "We're sorry, but this account has been disabled.&nbsp; If you feel that this is an error, please contact <a href=\"mailto:webmaster@mydomain?subject=Account Turned off for $user[name]\">Douglas</a>.&nbsp; Thank you. "; exit(); }
if (($group == "Administrator") || ($group == "Global Moderator") || ($group == "Moderator")) { header("Location: good.php");
exit; }

else

{
header("Location: bad.php");
exit;
}

?>