I need this indesign cs3 script to run under Indesign cs2

Question

This is paragraph changes script which is run under indesign cs 3, I need this  script to run under my indesign cs 2, can anyone help me pls?. thank you  in advance
    Fixing paragraph style combinations
    Version: 1.1
    Script by Thomas Silkjær
    http://indesigning.net/
var the_document = app.documents.item(0);
// Create a list of paragraph styles
var list_of_paragraph_styles = the_document.paragraphStyles.everyItem().name;
// Make the dialog box for selecting the paragraph styles
var the_dialog = app.dialogs.add({name:"Fix paragraph style pairs"});
with(the_dialog.dialogColumns.add()){
    with(dialogRows.add()){
        staticTexts.add({staticLabel:"Find:"});
    with(borderPanels.add()){
        var find_first_paragraph = dropdowns.add({stringList:list_of_paragraph_styles, selectedIndex:0});
        staticTexts.add({staticLabel:"followed by"});
        var find_second_paragraph = dropdowns.add({stringList:list_of_paragraph_styles, selectedIndex:0});
    with(dialogRows.add()){
        staticTexts.add({staticLabel:"Change:"});
    with(borderPanels.add()){
        var change_first_paragraph = dropdowns.add({stringList:list_of_paragraph_styles, selectedIndex:0});
        staticTexts.add({staticLabel:"followed by"});
        var change_second_paragraph = dropdowns.add({stringList:list_of_paragraph_styles, selectedIndex:0});
the_dialog.show();
// Define paragraph styles
var find_first_paragraph = the_document.paragraphStyles.item(find_first_paragraph.selectedIndex);
var find_second_paragraph = the_document.paragraphStyles.item(find_second_paragraph.selectedIndex);
var change_first_paragraph = the_document.paragraphStyles.item(change_first_paragraph.selectedIndex);
var change_second_paragraph = the_document.paragraphStyles.item(change_second_paragraph.selectedIndex);
// Set find grep preferences to find all paragraphs with the first selected paragraph style
app.findChangeGrepOptions.includeFootnotes = false;
app.findChangeGrepOptions.includeHiddenLayers = false;
app.findChangeGrepOptions.includeLockedLayersForFind = false;
app.findChangeGrepOptions.includeLockedStoriesForFind = false;
app.findChangeGrepOptions.includeMasterPages = false;
app.findGrepPreferences = NothingEnum.nothing;
app.findGrepPreferences.appliedParagraphStyle = find_first_paragraph;
app.findGrepPreferences.findWhat = "^";
//Search the current story
var the_story = app.selection[0].parentStory;
var found_paragraphs = the_story.findGrep();
var change_first_list = [];
var change_second_list = [];
// Loop through the paragraphs and create a list of words and mark them as index words
myCounter = 0;
do {
    try {
        // Create an object reference to the found paragraph and the next
        var first_paragraph = found_paragraphs[myCounter].paragraphs.firstItem();
        var next_paragraph = first_paragraph.paragraphs[-1].insertionPoints[-1].paragraphs[0];
        // Check if the next paragraph is equal to the find_second_paragraph
        if(next_paragraph.appliedParagraphStyle == find_second_paragraph) {
                change_first_list.push(first_paragraph);
                change_second_list.push(next_paragraph);
    } catch(err) {}
    myCounter++;
} while (myCounter < found_paragraphs.length);
// Apply paragraph styles
myCounter = 0;
do {
    change_first_list[myCounter].appliedParagraphStyle = change_first_paragraph;
    change_second_list[myCounter].appliedParagraphStyle = change_second_paragraph;
    myCounter++;
} while (myCounter < change_first_list.length);
alert("Done fixing pairs!");

Answer 1

CS2 didn't support grep searches so you're going to have to do some serious reworking of the script. It's not a flick of the wrists.
Dave