-customer_list_cells(_("Select a customer: "), 'customer_id', false, false, true);
+
+if(!isset($_POST['customer_id'])) {
+ if(isset($_GET['customer_id'])) {
+ $customer_id = $_GET['customer_id'];
+ $_POST['customer_id'] = $customer_id;
+ }
+else $customer_id = null;
+
+}
+else {
+ $customer_id = $_POST['customer_id'];
+}
+customer_list_cells(_("Select a customer: "), 'customer_id', $customer_id, true, true);