OS X Technologies :: Listing Folders In Apple-script Popup?

im looking for a more elegant way to list of folders in a popup for users to select at the beginning of my script and use as a path variable.the path i need to filter through to make the list is similar to the following: /Volumes/Network Drive/A/Client Name(s) starting with A//Volumes/Network Drive/B/Client Name(s) starting with B/ other folders will be created in the folder they select.  The complications:  All the folders i want to list are divided into folders labelled with each letter of the alphabet.Also there could potentially be hundreds of these folders once consolidated to a list The current script lists the entire file path in the popup. I want the entire path to be set as the variable but just the folder name to be listed in the popup These are the scrips i have started with but would love a better way to combine and clean up.  

(*set mainList to {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "XYZ"}choose from list mainList with prompt "Choose Client"set listchoice to result as text*)set the_folder to (path to desktop) as stringset with_subfolders to trueset inc_folders to true set the_files to get_folder_list(the_folder, with_subfolders, inc_folders)return the_files on get_folder_list(the_folder, with_subfolders, inc_folders)          set the_files to {}  

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Info:
Applescript, Mac OS X (10.7.4)