Merge even and odd pages

Question

My printer won't do duplex scan, and I need to scan a large amount of 2-sided text. So I'm going to create one document of the odd-numbered pages, and another of the even-numbered pages. I know I can manually combine them into the right order, but I'm hoping there is some automatic way to merge the documents - one of odd-numbered pages, and one of even-numbered pages - into one document in which the pages are in the correct numerical order.
Is there?

Answer 1

Hey Seth and others:
Thanks for the positive feedback. I found myself needing to do some collating and reversing again, and discovered that the script didn't show up in Acrobat 9. So I updated the script, and moved the menu item into the "Document" menu.
Unfortunately I can't figure out how to attach the updated script in the new form editor, so I'll inline it. Copy the following script into a file and install it into your Javascripts folder, as before.
// Complements: Planet PDF (http://www.planetpdf.com/)
// Modified by Jeff Baitis for Acrobat 9 compatibility
// Improved Collate function with status bar.
// Add a menu item to reverse all pages in the active document
app.addMenuItem({ cName: "Reverse", cParent: "Document", cExec: "trustedReversePages();", cEnable: "event.rc = (event.target != null);", nPos: 0 });
app.addMenuItem({ cName: "Collate", cParent: "Document", cExec: "trustedCollatePages();", cEnable: "event.rc = (event.target != null);", nPos: 0 });
trustedReversePages = app.trustedFunction(function()
  app.beginPriv(); // Explicitly raise privileges
  var t = app.thermometer;
  t.duration = this.numPages;
  t.begin();
  for (i = this.numPages - 1; i >= 0; i--)
    t.value = (i-this.numPages)*-1;
    this.movePage(i);
    t.text = 'Moving page ' + (i + 1);
  t.end();
  app.endPriv();
// Collating pages
  Title: Collate Document
  Purpose: User is prompted to select document to insert/collate.
  Author: Sean Stewart, ARTS PDF, www.artspdf.com
trustedCollatePages = app.trustedFunction(function()
  app.beginPriv(); // Explicitly raise privileges
  // create an array to use as the rect parameter in the browse for field
  var arRect = new Array();
  arRect[0] = 0;
  arRect[1] = 0;
  arRect[2] = 0;
  arRect[3] = 0;
  // create a non-visible form field to use as a browse for field
  var f = this.addField("txtFilename", "text", this.numPages - 1, arRect);
  f.delay = true;
  f.fileSelect = true;
  f.delay = false;
  // user prompted to select file to collate the open document with
  app.alert("Select the PDF file to merge with")
  // open the browse for dialog
  f.browseForFileToSubmit();
  var evenDocPath = f.value;
  var q = this.numPages;
  var t = app.thermometer;
  t.duration = q;
  t.begin();
  // insert pages from selected document into open document
  for (var i = 0; i < q; i++) {
      var j = i*2;
      this.insertPages(j, evenDocPath, i);
      t.value = i;
      t.text = 'Inserting page ' + (i+1);
  t.end();
  // remove unused field
  this.removeField("txtFilename");
  app.endPriv();
Have fun
Edited: Found some bugs, fixed the code up a bit