gmail/facebook chat - problemer med connect databasen

Hej eksperter.

Jeg bruger en chat på mit site, men kan ikke få den til at sætte noget som helst op i databasen.

Her er linket til den simple chat jeg bruger/har hentet:
http://anantgarg.com/2009/05/13/gmail-facebook-style-jquery-chat/

Jeg har placeret chat.php og .js filerne i samme location + en index.php med brugernavne som kommer fra tabellen 'bruger' hvor jeg har tilføjet lidt javascript på <a> som får chatten frem ved onclick.

Det virker fint med at de popper op, men der kommer intet op i tabellen 'chat' ? Hmm Kan I hjælpe mig med at finde fejlen.

chat.php

<?php

include 'databasen.php';

if ($_GET['action'] == "chatheartbeat") { chatHeartbeat(); }
if ($_GET['action'] == "sendchat") { sendChat(); }
if ($_GET['action'] == "closechat") { closeChat(); }
if ($_GET['action'] == "startchatsession") { startChatSession(); }


if (!isset($_SESSION['chatHistory'])) {
    $_SESSION['chatHistory'] = array();   
}

if (!isset($_SESSION['openChatBoxes'])) {
    $_SESSION['openChatBoxes'] = array();   
}

function chatHeartbeat() {
   
    $sql = "select * from true_life_chat where (chat.to = '".mysql_real_escape_string($_SESSION['bruger_navn'])."' AND recd = 0) order by id ASC";
    $query = mysql_query($sql);
    $items = '';

    $chatBoxes = array();

    while ($chat = mysql_fetch_array($query)) {

        if (!isset($_SESSION['openChatBoxes'][$chat['from']]) && isset($_SESSION['chatHistory'][$chat['from']])) {
            $items = $_SESSION['chatHistory'][$chat['from']];
        }

        $chat['message'] = sanitize($chat['message']);

        $items .= <<<EOD
                      {
            "s": "0",
            "f": "{$chat['from']}",
            "m": "{$chat['message']}"
      },
EOD;

    if (!isset($_SESSION['chatHistory'][$chat['from']])) {
        $_SESSION['chatHistory'][$chat['from']] = '';
    }

    $_SESSION['chatHistory'][$chat['from']] .= <<<EOD
                          {
            "s": "0",
            "f": "{$chat['from']}",
            "m": "{$chat['message']}"
      },
EOD;
       
        unset($_SESSION['tsChatBoxes'][$chat['from']]);
        $_SESSION['openChatBoxes'][$chat['from']] = $chat['sent'];
    }

    if (!empty($_SESSION['openChatBoxes'])) {
    foreach ($_SESSION['openChatBoxes'] as $chatbox => $time) {
        if (!isset($_SESSION['tsChatBoxes'][$chatbox])) {
            $now = time()-strtotime($time);
            $time = date('g:iA M dS', strtotime($time));

            $message = "Sent at $time";
            if ($now > 180) {
                $items .= <<<EOD
{
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;

    if (!isset($_SESSION['chatHistory'][$chatbox])) {
        $_SESSION['chatHistory'][$chatbox] = '';
    }

    $_SESSION['chatHistory'][$chatbox] .= <<<EOD
        {
"s": "2",
"f": "$chatbox",
"m": "{$message}"
},
EOD;
            $_SESSION['tsChatBoxes'][$chatbox] = 1;
        }
        }
    }
}

    $sql = "update true_life_chat set recd = 1 where chat.to = '".mysql_real_escape_string($_SESSION['bruger_navn'])."' and recd = 0";
    $query = mysql_query($sql);
   
    if ($items != '') {
        $items = substr($items, 0, -1);
    }
header('Content-type: application/json');
?>
{
        "items": [
            <?php echo $items;?>
        ]
}

<?php
            exit(0);
}

function chatBoxSession($chatbox) {
   
    $items = '';
   
    if (isset($_SESSION['chatHistory'][$chatbox])) {
        $items = $_SESSION['chatHistory'][$chatbox];
    }

    return $items;
}

function startChatSession() {
    $items = '';
    if (!empty($_SESSION['openChatBoxes'])) {
        foreach ($_SESSION['openChatBoxes'] as $chatbox => $void) {
            $items .= chatBoxSession($chatbox);
        }
    }


    if ($items != '') {
        $items = substr($items, 0, -1);
    }

header('Content-type: application/json');
?>
{
        "username": "<?php echo $_SESSION['bruger_navn'];?>",
        "items": [
            <?php echo $items;?>
        ]
}

<?php


    exit(0);
}

function sendChat() {
    $from = $_SESSION['bruger_navn'];
    $to = $_POST['to'];
    $message = $_POST['message'];

    $_SESSION['openChatBoxes'][$_POST['to']] = date('Y-m-d H:i:s', time());
   
    $messagesan = sanitize($message);

    if (!isset($_SESSION['chatHistory'][$_POST['to']])) {
        $_SESSION['chatHistory'][$_POST['to']] = '';
    }

    $_SESSION['chatHistory'][$_POST['to']] .= <<<EOD
                      {
            "s": "1",
            "f": "{$to}",
            "m": "{$messagesan}"
      },
EOD;


    unset($_SESSION['tsChatBoxes'][$_POST['to']]);

    $sql = "insert into true_life_chat (chat.from,chat.to,message,sent) values ('".mysql_real_escape_string($from)."', '".mysql_real_escape_string($to)."','".mysql_real_escape_string($message)."',NOW())";
    $query = mysql_query($sql);
    echo "1";
    exit(0);
}

function closeChat() {

    unset($_SESSION['openChatBoxes'][$_POST['chatbox']]);
   
    echo "1";
    exit(0);
}

function sanitize($text) {
    $text = htmlspecialchars($text, ENT_QUOTES);
    $text = str_replace("\n\r","\n",$text);
    $text = str_replace("\r\n","\n",$text);
    $text = str_replace("\n","<br>",$text);
    return $text;
}
?>