Building dynamic dialogs for Acrobat.

I am attempting to figure out how to build dynamic dialogs within Acrobat using Javascript.

I am attempting to write a generalized PDF page splitter.  The user selects a PDF document, and then the script analyzes the open document and determines that there are N pages in the document.  I am going to run through the document and make each page its own PDF.  Each page will be considered a certain kind of page, for example, Cover, Article, Ad, etc.  and the type of page it is will affect the naming convention I use when making the new, one-page file.  For example, let's say that pages 36, 37 and 38 are page, ad and article, respectively.  Then the names I will be using for each output file will be as follows:

P12345Pg_036.pdf

P12345Ad_037.pdf

P12345Ar_038.pdf

But there is no way for my code to actually look at a given page and decide that it is page, article, ad, or one of four cover types, etc.  So I want to build a dialog that looks something like this (assume a O is meant to be a radio button):

Page          Pagetype

1                  O Page      O Inner cover Front         O  Outer cover Front     O Ad           O   Article

...

This means a dynamic dialog.

I have looked at the Acrobat API and determined that defining a dialog looks something like this:

var DialogABC = {

                                   initialize: function(dialog){},

                                   commit : function(dialog){},

                                   ...

                                   description:{}

                           };

app.execDialog(DialogABC)

What I do not know how to do is create the dialog specification on the fly.  Do I treat it as a string or is there some other way of making this happen?  HOw can I make a dynamic description that allows for a variable number of rows?

Please let me know if you have any thoughts.  A good reference or example would serve just as well.

TIA!

John