Fatal Error i PHP script gennem Apache

Hejsa.
Jeg kører Apache 2.0.39 og PHP 4.2.3 på Win2000
Jeg har tilpasset et online messenger script, men får fejl når jeg skal køre det. Her er et link :
http://www.stoltenborg.info/messenger/

Min config.php til messenger ser således ud :

<?php

// MySQL database parameters
    $mysql_server = "localhost";
    $mysql_user    = "xxxxx";
    $mysql_password    = "xxxxx";
    $mysql_db = "xxxxx";
    //$mysql_port    = 2222";

// Messenger system parameters   
    $administrator = "controller"; // administrator of messenger
    $messengername = "Enterprise Messenger";
    $companylogo = 'logo.png'; // logo appear on top left of the screen
    $upperframeheight = 110;    // number of pixel on the upper part of the frame (usually height of logo)
    $errorcolor = "red";
    $oldmessagecolor = "blue";
    $newmessagecolor = "red";
    $onlinecolor = "green";
    $offlinecolor = "red";
    $offlineseconds = 40; // number of seconds lapsed considered as offline
    $refreshseconds = 30; // number of seconds to refresh user online date/time
    $allowselfregister = 1;    // allow register in signon screen
    $allowselfcompany_department = 1; // allow user to change company / department

// language path
    require_once("./messenger/language/language_english.php");

// initialise connection to messenger database
    $link = mysql_connect($mysql_server, $mysql_user, $mysql_password);
   
    // if connection failed, display error message and exit
    if(! $link) {
        echo "Connection to MySQL server failed";
        echo "<br>" . mysql_errno() . " " . mysql_error();
        exit;
    }
   
    if (! mysql_select_db($mysql_db)) {
        echo "Connection to Messenger database failed";
        echo "<br>" . mysql_errno() . " " . mysql_error();
        exit;
    }
?>