problemas con un chat

[edie8]

Buenas tengo un problema tengo un chat que me guarda el nombre del usuario que abla en vez del id, si cambio para que me guarde el id ya no me sale el nombre en el chat sino este id, este es mi codigo aber si me podeis ayudar y dar ideas de como modificarlo:
chat.php

Código PHP:

<?php
define ('DBPATH','localhost');
define ('DBUSER','root');
define ('DBPASS','pass');
define ('DBNAME','muroredsocial');
 
session_start();
 
global $dbh;
$dbh = mysql_connect(DBPATH,DBUSER,DBPASS);
mysql_selectdb(DBNAME,$dbh);
 
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() {
    
    $sql = "select * from chat where (chat.to = '".mysql_real_escape_string($_SESSION['logueado_nombre'])."' 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;
        }
        }
    }
}
 
    $sql = "update chat set recd = 1 where chat.to = '".mysql_real_escape_string($_SESSION['logueado_nombre'])."' 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['logueado_nombre'];?>",
        "items": [
            <?php echo $items;?>
        ]
}
 
<?php
 
 
    exit(0);
}
 
function sendChat() {
    $from = $_SESSION['logueado_nombre'];
    $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']]);
 
    $sql = "insert into chat (chat.from,chat.to,message,sent) values ('".mysql_real_escape_string($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;
}
 

este es el que guardaria el id de cada usuario, el problema lo tengo en el ajax que muestra el chat.