Using PHP to generate Open Sales Order

I'd like to use PHP to reproduce the Open Sales Order Query available on the web site ( Reports -> Saved Reports -> Custom Open Sales Orders ).

Question:

How can I query for all the Sales Order where openStatus is not NULL?

Background:

I'm using the nsLib.php with the NetSuite distribution of NuSoap and PHP 5.2.x

Primarily I'm interested in generating a query that gives me back all the sales order with orderStatus equal to any value.
$orderStatusSB = new nsSearchBasic("TransactionSearchBasic", "");
$result = searchBasic ($client, $orderStatusSB, 10, false);

I've also added a searchNext to the nsLib.php to make paging through records.