Logout method fails to.. do anything (cookies/sessions/redirection)

[Phil Powell]

[PHP]
<?php

class LoginSessionGen erator {

/**
* Logout
*
* @access public
*/
function &logout() { // STATIC VOID METHOD
global $projectFolderN ame, $projectURLPath , $willUseSSL,
$willAuthentica te, $willBasicAuthe nticate, $projectAcronym ;
if ($willAuthentic ate || $willBasicAuthe nticate)
setcookie("$pro jectFolderName" , '', time() - 86400, '/'); // DELETE
COOKIE
foreach ($_SESSION as $key => $val) {
if (preg_match("/^{$projectAcron ym}_/i", $key)) {
unset($_SESSION[$key]); // DELETE ALL PROJECT SESSION
VARIABLES
session_unregis ter("$key"); // DELETE FROM THE SESSION FILE
REFERENCED BY $PHPSESSID
}
}
if ($willBasicAuth enticate) {
unset($_SERVER['PHP_AUTH_USER']);
unset($_SERVER['PHP_AUTH_PW']);
if (preg_match('/IIS/i', $_SERVER['SERVER_SOFTWAR E']))
unset($_SERVER['HTTP_AUTHENTIC ATION']);
}
header('Pragma: no-cache'); // ENSURE CLIENT-SIDE CACHE
FLUSHING
if ($willAuthentic ate && $willUseSSL) {
$dest = 'https://' . $_SERVER['SERVER_NAME'] .
"$projectURLPat h/index.php";
} elseif ($willBasicAuth enticate && $willUseSSL) {
$dest = 'https://EnterYourUserNa me:EnterPasswor d@' .
$_SERVER['SERVER_NAME'] . "$projectURLPat h/index.php";
} elseif ($willAuthentic ate) {
$dest = 'http://' . $_SERVER['SERVER_NAME'] .
"$projectURLPat h/index.php";
} elseif ($willBasicAuth enticate) {
$dest = 'http://EnterYourUserNa me:EnterPasswor d@' .
$_SERVER['SERVER_NAME'] . "$projectURLPat h/index.php";
}
header("Locatio n: $dest"); // DEFAULT REDIRECT TO MAIN PAGE
exit();
}

}

?>
[/PHP]

The following class method is evoked to ensure a user is logged out by
deleting their cookie, deleting session variables and redirecting
them.

Everything worked beautifully while using Mozilla Firefox 0.6, but the
moment I tried using the same app with MSIE it did absolutely nothing;
it did not delete cookie, session variables, it didn't even redirect!

Please help I'm stuck here!

Thanx
Phil