Automatic logout all userspice pages when one of them is logged out

[Angel]

hi Brian,

I just added the js code at the bottom of header.php and created the logoutcheck.php in the helpers folder. The html div is also created with the following code in header.php:
<div id = "loginstatus" style = "display: none" >
<?php
if ($user->isLoggedIn()==False){
echo "Not Logged In";
}else{
echo "Logged In";
}
?>
</div>

I notice that when the javascript post data to logoutcheck.php, there is an error saying:
Access forbidden!

You don't have permission to access the requested object. It is either read-protected or not readable by the server.

If you think this is a server error, please contact the webmaster.

Error 403

Is there anything wrong with my implementation?

Thanks
Angel