scripting label in InDesign CS5 vs CS4

I have read through a few (several) of the posts and am not finding info that I understand to help me with this specific problem.

I am editing a script that was written by another person several years ago and struggling to get it to work with InDesign CS5. The error I get seems to point to this bit of code that I believe creates a list from "labeled" text boxes in my documents. These boxes are later targeted and the content of them is changed based on the user's selection. As I understand it, the method or referring to these labels has changed in CS5, but the examples I have seen are all javascript or something other than Applee Script as far as I could tell.

--create references to Pass check boxes

try

    set passTextFrames to every text frame of all page items whose label is "Pass Text Frame"

on error

    display dialog "There is no labeled box in this document. Please click on the Cancel button, then place a slug from the slug library and re-run the script." buttons {"Cancel"} default button 1

end try

Later the code used to change the content of these frames is:

Thanks for any help you can offer!