//loginhandler function
...
function checkPermission($group)
	{
	    
	    if (isset($_SESSION['usergroup']))
	    {								
  		return ($_SESSION['usergroup']<=$group);	// Returning true means that //
	    }							// the user has permission. //
	    else
            {
		throw new Exception("User not logged in.");
	    }
	}
...

//index

try{
	if(!($LoginHandler->checkPermission(1)))
	{
		header('Location: index.php');
	}
} catch (Exception $e)
{
	echo "Error:". $e->getMessage() ."\n";
}