How can I get my Indesign script to apply to all pages in the document?

Question

My script (java) shown below will only apply to the first page of the document. How can i get it to apply to all pages of my document? What am I missing? Thanks.
scirpt:
myDocument = app.activeDocument
with (myDocument.pages.item(0).marginPreferences){
columnCount = 1;
//columnGutter can be a number or a measurement string.
columnGutter = "0";
bottom = "0"
//When document.documentPreferences.facingPages == true,
//"left" means inside; "right" means outside.
left = "0"
right = "0"
top = "0"
inside = "0"

Answer 1

Hi,
You have to iterate through all pages.marginPreferences:
var
  myDocument = app.activeDocument,
  allPagesMaPref = myDocument.pages.everyItem().marginPreferences,
  curPageMaPref;
while ( curPageMaPref = allPagesMaPref.pop() )
  with (curPageMaPref) {
  columnCount = 1;
  //columnGutter can be a number or a measurement string.
  columnGutter = "0";
  bottom = "0"
  //When document.documentPreferences.facingPages == true,
  //"left" means inside; "right" means outside.
  left = "40"
  right = "0"
  top = "0"
  inside = "0"
Jarek