Script to modify multiple files

Question

This script is supposed to open, modify, save, and close all files within a chosen folder.
There are a couple problems with the script
The files are "legacy" .eps and .ai, so a save dialog pops up. I want to save the file and move on, suppressing dialogs if possible
Only the first file is opened
If I comment out the line inside the for loop that runs the convertToUncoated() function, all of the files will open. If there is a way to upload the test files I'll gladly do that.
#target illustrator
* Author: Jeff Hines
* ThankYou: http://forums.adobe.com/people/elDudereno
* Brief: Converts Pantone 143 and 287 to their uncoated equivalent
var useFolder = false;
try {
    // If we have an open document, let's work on that
    sourceDoc = app.activeDocument;
    convertToUncoated(sourceDoc);
catch(err) {
    useFolder = true;
if(useFolder != false) {
    // Choose a folder, gets stored here
    sourceFolder = Folder.selectDialog("Please choose the folder.");
    // Array of files
    files = sourceFolder.getFiles();
    // Number of files
    filesLength = files.length;
    // Loop through files
    for(i=0; i<filesLength; i++) {
        // Current document
        sourceDoc = app.open(files[i]);
        // Run the conversion
        convertToUncoated(sourceDoc);
        // Try closing the document
        sourceDoc.close(SaveOptions.SAVECHANGES);
function convertToUncoated(theDocument) {
    var docRef = theDocument;
    with (docRef) {
        // Unlock layers
        for(i=0; i<layers.length; i++) {
            layer = layers[i];
            if(layer.locked == true)
                layer.locked = false;
        try {
            // New color: 143 U
            newColor143 = new LabColor();
            newColor143.l = 74;
            newColor143.a = 30;
            newColor143.b = 56;           
            // New spot color, gets added to swatches
            newSpot143 = spots.add();
            newSpot143.name = 'PANTONE 143 U';
            newSpot143.colorType = ColorModel.SPOT;
            newSpot143.color = newColor143;
        catch(err) {
            newSpot143.remove();
        // Get the replacement color for 143
        replacement143 = swatches.getByName('PANTONE 143 U').color;
        try {
            // New color: 287 U
            newColor287 = new LabColor();
            newColor287.l = 38;
            newColor287.a = 4;
            newColor287.b = -38;
            // New spot color, gets added to swatches
            newSpot287 = spots.add();
            newSpot287.name = 'PANTONE 287 U';
            newSpot287.colorType = ColorModel.SPOT;
            newSpot287.color = newColor287;
        catch(err) {
            newSpot287.remove();
        // Get the replacement color for 287
        replacement287 = swatches.getByName('PANTONE 287 U').color;
        // Loop through paths
        for (i=0; i<pathItems.length; i++) {
            with (pathItems[i]) {
                if (filled == true && fillColor instanceof SpotColor) {
                    if (fillColor.spot.name == 'PANTONE 143') fillColor = replacement143;    
                    if (fillColor.spot.name == 'PANTONE 287') fillColor = replacement287;
                if (stroked == true && strokeColor instanceof SpotColor) {
                    if (strokeColor.spot.name == 'PANTONE 143') strokeColor = replacement143;
                    if (strokeColor.spot.name == 'PANTONE 287') strokeColor = replacement287;
        // Loop through stories
        for (j=0; j<stories.length; j++) {
            with (stories[j]) {
                for (var k = 0; k < characters.length; k++) {
                    with (characters[k].characterAttributes) {
                        if (fillColor instanceof SpotColor) {
                            if (fillColor.spot.name == 'PANTONE 143') fillColor = replacement143;
                            if (fillColor.spot.name == 'PANTONE 287') fillColor = replacement287;
                        if (strokeColor instanceof SpotColor) {
                            if (strokeColor.spot.name == 'PANTONE 143') strokeColor = replacement143;
                            if (strokeColor.spot.name == 'PANTONE 287') strokeColor = replacement287;
        try {
            // Remove old swatches here
            swatches.getByName('PANTONE 143').remove();
            swatches.getByName('PANTONE 287').remove();
        catch(err) {}
        return true;

Answer 1

* ThankYou: http://forums.adobe.com/people/Muppet%20Mark && http://forums.adobe.com/people/elDudereno
Mostly Mark. I just pointed the way. Good job Jeff.