Updating Dave Saunders find style/change case script

Question

How can I update a Dave Saunders script from CS1 and CS2 to CS5?
he wrote a brilliant script which searches for a paragraph style and changes the case to upper or lower.
However, it was for CS1 and CS2.   I can 't get it to run on CS5.
it trips up on
  app.findPreferences = null;
object does not support 'findPreferences'
here is the script.  thanks for your help!
//DESCRIPTION: Converts text in designated parastyle to designated case
if ((app.documents.length != 0) && (app.selection.length != 0)) {
myDoc = app.activeDocument;
myStyles = myDoc.paragraphStyles;
myStringList = myStyles.everyItem().name;
myCaseList = ["Uppercase","Lowercase", "Title case", "Sentence case"];
myCases = [ChangecaseMode.uppercase, ChangecaseMode.lowercase, ChangecaseMode.titlecase, ChangecaseMode.sentencecase];
var myDialog = app.dialogs.add({name:"Case Changer"})
with(myDialog){
  with(dialogColumns.add()){
   with (dialogRows.add()) {
    with (dialogColumns.add()) {
     staticTexts.add({staticLabel:"Paragraph Style:"});
    with (dialogColumns.add()) {
     myStyle = dropdowns.add({stringList:myStringList,selectedIndex:0,minWidth:133});
   with (dialogRows.add()) {
    with (dialogColumns.add()) {
     staticTexts.add({staticLabel:"Change Case to:"});
    with (dialogColumns.add()) {
     myCase = dropdowns.add({stringList:myCaseList,selectedIndex:0,minWidth:133});
var myResult = myDialog.show();
if (myResult != true){
  // user clicked Cancel
  myDialog.destroy();
  errorExit();
  theStyle = myStyle.selectedIndex;
  theCase = myCase.selectedIndex;
  myDialog.destroy();
  app.findPreferences = null;
  app.changePreferences = null;
  myFinds = myDoc.search('',false,false,undefined,{appliedParagraphStyle:myStyles[theStyle]});
  myLim = myFinds.length;
  for (var j=0; myLim > j; j++) {
   myFinds[j].texts[0].changecase(myCases[theCase]);
} else {
errorExit();
// +++++++ Functions Start Here +++++++++++++++++++++++
function errorExit(message) {
if (arguments.length > 0) {
  if (app.version != 3) { beep() } // CS2 includes beep() function.
  alert(message);
exit(); // CS exits with a beep; CS2 exits silently.

Answer 1

I've adapted seddybell's new script so that it works with paragraph styles instead of character styles. Hope that's useful to someone.
//DESCRIPTION: Update of Dave Saunder's ChangeCaseOfSelectedStyle script for CS5 and later
//jblondie: Fork of seddybell's update so that you can select by Paragraph Style instead of Character Style.
if ((app.documents.length != 0) && (app.selection.length != 0)) {
myDoc = app.activeDocument;
myStyles = myDoc.paragraphStyles; //jblondie: replaced character with paragraph
myStringList = myStyles.everyItem().name;
myCaseList = ["UPPERCASE","lowercase", "Title Case", "Sentence case"]; //jblondie: Changed myCaseList so it's consistent with InDesign's built in Change Case tool
myCases = [ChangecaseMode.uppercase, ChangecaseMode.lowercase, ChangecaseMode.titlecase, ChangecaseMode.sentencecase];
var myDialog = app.dialogs.add({name:"Case Changer"})
with(myDialog){
  with(dialogColumns.add()){
   with (dialogRows.add()) {
    with (dialogColumns.add()) {
     staticTexts.add({staticLabel:"Paragraph Style:"}); //jblondie: replaced Character with Paragraph
    with (dialogColumns.add()) {
     myStyle = dropdowns.add({stringList:myStringList,selectedIndex:0,minWidth:133}) ;
   with (dialogRows.add()) {
    with (dialogColumns.add()) {
     staticTexts.add({staticLabel:"Change Case to:"});
    with (dialogColumns.add()) {
     myCase = dropdowns.add({stringList:myCaseList,selectedIndex:0,minWidth:133});
var myResult = myDialog.show();
if (myResult != true){
  // user clicked Cancel
  myDialog.destroy();
  errorExit();
  theStyle = myStyle.selectedIndex;
  theCase = myCase.selectedIndex;
  myDialog.destroy();
  app.findTextPreferences = NothingEnum.NOTHING;
  app.changeTextPreferences = NothingEnum.NOTHING;
  app.findTextPreferences.appliedParagraphStyle = myStyles [theStyle]; var myFinds = myDoc.findText(); //jblondie: replaced Character with Paragraph
  myLim = myFinds.length;
  for (var j=0; myLim > j; j++) {
   myFinds[j].texts[0].changecase(myCases[theCase]);
} else {
errorExit();
// +++++++ Functions Start Here +++++++++++++++++++++++
function errorExit(message) {
if (arguments.length > 0) {
  if (app.version != 3) { beep() }
  alert(message);
exit();