Customize folding pages

Hi,

I am using a folding page plugin and I need help customizing the plugin.

Here are my pages

-------------------------------------------------------------------

Home
About Us
-------Corporation
-------Portfolio
Services
-------Service 1
-------Service 2
-------------Service 2a
-------------Service 2b
-------Service 3
Contact Us

-------------------------------------------------------------

The Folding pages shows the navigation as it is however, I want Only the sub pages of a page at Level 1. For instance, if the user is on Services page, folding pages should show Service 1, Service 2 and Service 3. When the user is on Service 2, it should expand service 2 and retain Service 1 and Service 3 links in the side bar like this,

(desired output when user is on Service 2a)

-------------------------------------------------------------------
Services
-------Service 1
-------Service 2
-------------Service 2a
-------------Service 2b
-------Service 3

-------------------------------------------------------------

Desired output on Service 1

-------------------------------------------------------------------
Services
-------Service 1
-------Service 2
-------Service 3

-------------------------------------------------------------

I don’t want the first level pages Home, Service, Contact Us to be shown in the side bar as they are being shown in the menu bar.

How can I a achieve this type of sub page listing in wordpress.

[ Please do not bump, that’s not permitted here. ]