Different Subforms displayed dependnt on selection from Drop Down menu

Well,
I've managed to get the correct subforms to display/hide when I choose the first item from a DROP DOWN menu.
(Thanks to Thomp and ssubquark!!)
But now I've run into a another problem.
As I described earlier there are several different options for this form:
New Installation
Broken Seal
EPROM Replace
...
The form itself is broken down into 9 subforms.
So - a New Installation might requires sections 1,4,5,6,7,8 to be visible, but 2 & 3 invisible (ie not necessary to complete.

and a Broken Seal needs only 1,3,5,6 & 8 - again the other subforms to be 'invisible'

Here's the java:
if (form1.ClassIIIncidentReportForm.ClassIIReportFormTotal.ClassIIReportTitle.ServicePerformed.xfa.event.change == "New Installation") then
ClassIISection1.presence = "invisible";
ClassIISection3.presence = "invisible";
ClassIISection2.presence = "visible";
ClassIISection4.presence = "visible";
ClassIISection5.presence = "visible";
ClassIISection6.presence = "visible";
ClassIISection7.presence = "visible";
ClassIISection8.presence = "visible";
ClassIISection9.presence = "visible";
}

That much works fine!

Now if the User selects: Broken Seal a different set of subforms will be displayed.

If I try to use an 'endif' or 'else' type command to append this next group nothing happens at all.

FormCalc reference from the 'helpfile' suggests:
"if ( simple expression ) then
list of expressions
elseif ( simple expression ) then
list of expressions
else
list of expressions
endif"

So - should I be using FormCalc or Java?? If so how? There are 5 options for the user to choose from resulting in various combinations of the 9 subforms.

Help! As brain is now fried!
thanks
Al