Allow customer to manage contacts for an organization?

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Hello,

I have a need to allow a contact to log into the customer portal, see a list of all the organizations the contact is related to, select an organization, and then manage all the contacts for the selected organization.

I have created an org2contacts custom object and successfully set up a many to many relationship between the organization and contacts table.

Now I need to allow a contact to log in to the portal, see the list of organizations the contact is related to and then drill down to see a list of the contacts for that organization, once they see the list of contacts for the selected organization, I need to offer them the ability to check a field to indicate that the contact should be removed from the organization, insert a new contact, or update a contact's information.