Radio Buttons – How to Hide and make visible multiple / random text fields using two buttons

Hello, I need to create a form that, All fields are Hidden but  If you select "Dealer Warranty" Radio Button, 9 of the 10 Text Fields will be visible but if you select "Service Technician" only 8 Fields will be visible but not necessarily the same ones.

Example:

I am using:

MAIN.Page1.RadioButtonList.Dealer::click - (JavaScript, client)

if (MAIN.Page1.RadioButtonList.Dealer.selectedIndex == 0)

{ MAIN.Page1.Distributor_Name.presence = "visible";

MAIN.Page1.Machine_Owner.presence = "visible"; }

else { MAIN.Page1.Distributor_Name.presence = "invisible";

MAIN.Page1.Machine_Owner.presence = "invisible"; }

MAIN.Page1.RadioButtonList.Service::click - (JavaScript, client)

if(MAIN.Page1.RadioButtonList.Service.selectedIndex == 0)

{ MAIN.Page1.Distributor_Name.presence = "visible";

MAIN.Page1.Machine_Owner.presence = "visible"; }

else { MAIN.Page1.Distributor_Name.presence = "visible";

MAIN.Page1.Machine_Owner.presence = "visible"; }

But it will only work on one of the fields and not the other.  I need to do this with about 30 Text fields on the page.

Can someone please help!