Calling an applescript inside a Javascript, waiting for it to complete before moving on.

Question

I've got a handly little applescript compiled as an app that performs an Adobe Illustrator action which exports the current file's artboard #1 to a specific location at 300ppi. I can even call it from a javascript... which is great because I want a javascript that will loop x times, changing text and exporting on each each loop. But, each loop will export a file with the same name... not a problem, I'll rename the file after each loop, and javascript will wait patiently for me the export to complete before moving on to the next step, right? Wrong! Javascript just keeps moving through the script.
So, how do I get Javascript to wait until the AppleScript completes the export? I can't have it wait a specific amount of time...export might take between 2 and 180 seconds.
My ideas:
1) can the applescript fire some sort of event letting Javascript know to move on?
2) Is there a Javascript equivalent to AppleScripts "do javavscript " command, which would allow me to move the Applescript code into my core javascript?
3) I could kludge a stopwatch on the first loop, checking every 10 milliseconds to see if the exported jpg file has been written... then using that as a baseline timer to pause later loops (not great, because the file will exist while AI writes it, and JS may rename it and try to export the second loop before the first is done).
for (z =0; z<copyArray.length; z++) {
var jpgExt = "-01.jpg";
var newExt = ([z] + jpgExt);
var exportASfile = File('/Applications/Adobe Illustrator CS5.1/Presets.localized/en_US/Scripts/VCS_Specialty Scripts/StandardExport.app');
exportASfile.execute();  // export the file
renamedFile = new File(exportFile); //variable exportFile is a reference to the jpg being written by the export
renamedFile.rename (exportFile.name.replace(jpgExt, newExt)   ); // replaces part of the filename with a new

Answer 1

I'd love to stay in one language, but since we're stuck on CS5 here, I have to make do.
My task for the script:
1) pop up a window to collect: 1a) number of copies, 1b) custom text, 1c) choice of three radio buttons -- I can't figure out how to do this in AS besides popping up three separate dialogs, I have it working great in JS
2) loop step 1, write a named text frame with an array value containing a concatenation of 1a, 1b, 1c  -- pretty easy in either
3) loop step 2, export the file at a higher than 72ppi resolution with artboard -- currently controlled by an action, can't be done programmatically in either AS or JS using CS5
4) loop step 3, rename the file to match what was written to the text frame -- again, pretty easy in either
In CS5, neither JS or AS have the ability to control the resolution of a jpg when exporting.... just the scale. So an action is required.
My window JS has some of the basic edittext, statictext, buttons, panels elements, not too tricky:
var win = new Window ("dialog","Cover Copy Builder");
    win.orientation = "column";
    win.add ("statictext", undefined, "Copy and Format Instructions");
    var input = win.add('panel', [0,0,320,300],  undefined, {borderless:true} );
    win.add ("statictext", undefined, "Output Summary");
etc.
Is there an AS equivalent to this sort of window building construction?