ok i have a main document that displays a chatbox, what i want is for the chatbox to refreash on everyone who is logged in's screen whenever someone posts a new message...

ive tried many methods including sleep timers and new functions that call then sleep and get recalled but this just generates an endless line of the same or little diffrent data making the form unusable until error...

this is my code

<?php

// set error reporting level
if (version_compare(phpversion(), "5.3.0", ">=") == 1)
 error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED);
else
 error_reporting(E_ALL & ~E_NOTICE);

require_once('inc/login.inc.php');
require_once('inc/chat.inc.php');

// initialization of login system and generation code

$oSimpleLoginSystem = new SimpleLoginSystem();

$oSimpleChat = new SimpleChat();

// draw login box
echo $oSimpleLoginSystem->getLoginBox();


// draw chat application
$sChatResult = '<font color="0x99000">
        <a href="Register_form.html">New Account</a><br>
        login to send a message<br>
        or register for a new account</font>';

if ($_COOKIE['member_name'] && $_COOKIE['member_pass'])
{
 if ($oSimpleLoginSystem->check_login($_COOKIE['member_name'], $_COOKIE['member_pass'])) {

 $sChatResult = "";
 if($oSimpleLoginSystem->check_privledges($_COOKIE['member_name']) >= 2)
 {
 $sChatResult .= "<br>privledge check Working<br>";

 }
 $sChatResult .= "<form action=$_SERVER[PHP_SELF] method='post'>
<input type='hidden' name='foo' value='<?= $foo ?>' />
<input type='submit' name='submit' value='Refresh Messages' />
</form>";
 $sChatResult .= $oSimpleChat->acceptMessages();
 $sChatResult .= "<br><br>";
 $sChatResult .= $oSimpleChat->getMessages();

 }
}

echo $sChatResult;

?>