🚀 go-pugleaf

I'm fairly new to scripting and I'm trying to write a script to add pages, inserting one after each existing page. We're doing postcards using a 4-up data merge. On the back of each card is the data merge/address (again, 4 to a page). Since the merge doesn't work on alternating pages, we want to do the merge first, then add the face pages afterward.
This is my code thus far:

var myPages = app.activeDocument.pages;
var myCounter = myPages.length-1;

for (i = myCounter; i >= 0; i--){

	myPages.add(LocationOptions.AFTER)...;

	}

On the line "myPages.add(LocationOptions.AFTER)..." I have tried every combination I can think of based on the CS3 Object Model that comes with Extend Script. Every one except the right one.

Many thanks for you help.
-Tim