Edit script from JPEG to PNG

I've been spending hours trying to edit this script I have that edits a smart layer and then saves all groups as a JPEG. This is great but sometimes I need to save each group as a PNG instead. Problems I've been encountering is the final file having been cropped to match the size of the picture inside the smart layer, when all files should be 483px x 483px and transparent.

Here is the script I use. If someone could edit it for me I would be so grateful. Many thanks in advance.

	// select files and place in a selected smart object;
	// to cause the so in the so to be scaled to fit the resolution is temprarily changed, but this is no guarantee for this to happen;
	// 2015, use it at your own risk;
	#target photoshop
	if (app.documents.length > 0) {
	var myDocument = app.activeDocument;
	var theName= myDocument.name.match(/(.*)\.[^\.]+$/)[1];
	var thePath = myDocument.path;
	var theLayer = myDocument.activeLayer;
	// psd options;
	psdOpts = new PhotoshopSaveOptions();
	psdOpts.embedColorProfile = true;
	psdOpts.alphaChannels = true;
	psdOpts.layers = true;
	psdOpts.spotColors = true;
	// check if layer is smart object;
	if (theLayer.kind != "LayerKind.SMARTOBJECT") {alert ("selected layer is not a smart object")}
	else {
	if ($.os.search(/windows/i) != -1) {var theFiles = File.openDialog ("please select files", "*.pdf;*.ai;*.psd;*.tif;*.png", true)}
	else {var theFiles = File.openDialog ("please select files", getFiles, true)};
	if (theFiles) {
	// set to pixels;
	var originalRulerUnits = app.preferences.rulerUnits;
	app.preferences.rulerUnits = Units.PIXELS;
	// get bounds;
	var theBounds = theLayer.bounds;
	// work through the array;
	for (var m = 0; m < theFiles.length; m++) {
	var theNewName = File(theFiles[m]).name.match(/(.*)\.[^\.]+$/)[1];
	// replace smart object;
	placeSmartObjectInSmartObject(app.activeDocument.activeLayer, theFiles[m]);
	#target photoshop
	function main(){
	if(!documents.length) return;
	var doc = activeDocument;
	var oldPath = activeDocument.path;
	for(var a=0;a<doc.layerSets.length;a++){
	activeDocument.activeLayer = activeDocument.layers.getByName(doc.layerSets[a].name);
	dupLayers();
	activeDocument.mergeVisibleLayers();
	activeDocument.trim(TrimType.TRANSPARENT,true,true,true,true);
	var saveFile= File(oldPath+"/"+doc.layerSets[a].name.replace("*****", theNewName) +".jpg");

 

 

var fileName = theNewName.slice(0,5);

 

if (doc.layerSets[a].name.indexOf("*****") != -1) {

 

var saveFile= File(oldPath+"/"+doc.layerSets[a].name.replace("*****", fileName) +".jpg");

 

}

 

else {

 

var saveFile= File(oldPath+"/"+doc.layerSets[a].name+"_"+fileName +".jpg");

 

};

 

	saveJPG(saveFile,10);
	app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
	}
	}
	main();
	function dupLayers() {
	var desc143 = new ActionDescriptor();
	var ref73 = new ActionReference();
	ref73.putClass( charIDToTypeID('Dcmn') );
	desc143.putReference( charIDToTypeID('null'), ref73 );
	desc143.putString( charIDToTypeID('Nm  '), activeDocument.activeLayer.name );
	var ref74 = new ActionReference();
	ref74.putEnumerated( charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt') );
	desc143.putReference( charIDToTypeID('Usng'), ref74 );
	executeAction( charIDToTypeID('Mk  '), desc143, DialogModes.NO );
	}
	function saveJPG(saveFile, jpegQuality) {
	app.activeDocument.flatten();
	jpgSaveOptions = new JPEGSaveOptions();
	jpgSaveOptions.embedColorProfile = true;
	jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
	jpgSaveOptions.matte = MatteType.NONE;
	jpgSaveOptions.quality = jpegQuality; //1-12
	activeDocument.saveAs(saveFile, jpgSaveOptions, true,Extension.LOWERCASE);
	}

// undo; 

myDocument.activeHistoryState = myDocument.historyStates[myDocument.historyStates.length-2] 

}; 

// reset; 

originalRulerUnits = app.preferences.rulerUnits; 

} 

} 

}; 

	////// open smart object //////
	function placeSmartObjectInSmartObject (theLayer, thisFile) {
	if (theLayer.kind == "LayerKind.SMARTOBJECT") {
	// get prefernces setting;
	var ref = new ActionReference();
	ref.putProperty(stringIDToTypeID("property"), stringIDToTypeID("generalPreferences"));
	ref.putEnumerated( charIDToTypeID("capp"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
	var applicationDesc = executeActionGet(ref);
	var generalDesc = applicationDesc.getObjectValue(stringIDToTypeID("generalPreferences"));
	var resizeDuringPlace = generalDesc.getBoolean(stringIDToTypeID("resizePastePlace"));
	if (resizeDuringPlace == false) {
	// =======================================================
	var idsetd = charIDToTypeID( "setd" );
	var desc1 = new ActionDescriptor();
	var idnull = charIDToTypeID( "null" );
	var ref1 = new ActionReference();
	var idPrpr = charIDToTypeID( "Prpr" );
	var idGnrP = charIDToTypeID( "GnrP" );
	ref1.putProperty( idPrpr, idGnrP );
	var idcapp = charIDToTypeID( "capp" );
	var idOrdn = charIDToTypeID( "Ordn" );
	var idTrgt = charIDToTypeID( "Trgt" );
	ref1.putEnumerated( idcapp, idOrdn, idTrgt );
	desc1.putReference( idnull, ref1 );
	var idT = charIDToTypeID( "T  " );
	var desc2 = new ActionDescriptor();
	var idresizePastePlace = stringIDToTypeID( "resizePastePlace" );
	desc2.putBoolean( idresizePastePlace, true );
	var idlegacyPathDrag = stringIDToTypeID( "legacyPathDrag" );
	desc2.putBoolean( idlegacyPathDrag, true );
	var idGnrP = charIDToTypeID( "GnrP" );
	desc1.putObject( idT, idGnrP, desc2 );
	executeAction( idsetd, desc1, DialogModes.NO );
	};
	// =======================================================
	var idplacedLayerEditContents = stringIDToTypeID( "placedLayerEditContents" );
	var desc2 = new ActionDescriptor();
	executeAction( idplacedLayerEditContents, desc2, DialogModes.NO );
	// set to high resolution to make scaling on placing probable;
	var theResolution = activeDocument.resolution;
	activeDocument.resizeImage(undefined, undefined, 3000, ResampleMethod.NONE);
	// place so;
	// =======================================================
	var idPlc = charIDToTypeID( "Plc " );
	var desc4 = new ActionDescriptor();
	var idAs = charIDToTypeID( "As  " );
	var desc5 = new ActionDescriptor();
	var idfsel = charIDToTypeID( "fsel" );
	var idpdfSelection = stringIDToTypeID( "pdfSelection" );
	var idpage = stringIDToTypeID( "page" );
	desc5.putEnumerated( idfsel, idpdfSelection, idpage );
	var idPgNm = charIDToTypeID( "PgNm" );
	desc5.putInteger( idPgNm, 1 );
	var idCrop = charIDToTypeID( "Crop" );
	var idcropTo = stringIDToTypeID( "cropTo" );
	var idtrimBox = stringIDToTypeID( "trimBox" );
	desc5.putEnumerated( idCrop, idcropTo, idtrimBox );
	var idPDFG = charIDToTypeID( "PDFG" );
	desc4.putObject( idAs, idPDFG, desc5 );
	var idnull = charIDToTypeID( "null" );
	desc4.putPath( idnull, new File( thisFile ) );
	var idFTcs = charIDToTypeID( "FTcs" );
	var idQCSt = charIDToTypeID( "QCSt" );
	var idQcsa = charIDToTypeID( "Qcsa" );
	desc4.putEnumerated( idFTcs, idQCSt, idQcsa );
	var idOfst = charIDToTypeID( "Ofst" );
	var desc6 = new ActionDescriptor();
	var idHrzn = charIDToTypeID( "Hrzn" );
	var idRlt = charIDToTypeID( "#Rlt" );
	desc6.putUnitDouble( idHrzn, idRlt, 0.000000 );
	var idVrtc = charIDToTypeID( "Vrtc" );
	var idRlt = charIDToTypeID( "#Rlt" );
	desc6.putUnitDouble( idVrtc, idRlt, 0.000000 );
	var idOfst = charIDToTypeID( "Ofst" );
	desc4.putObject( idOfst, idOfst, desc6 );
	var idAntA = charIDToTypeID( "AntA" );
	desc4.putBoolean( idAntA, true );
	executeAction( idPlc, desc4, DialogModes.NO );
	// toggle visibility of others;
	// =======================================================
	var idShw = charIDToTypeID( "Shw " );
	var desc10 = new ActionDescriptor();
	var idnull = charIDToTypeID( "null" );
	var list4 = new ActionList();
	var ref7 = new ActionReference();
	var idLyr = charIDToTypeID( "Lyr " );
	var idOrdn = charIDToTypeID( "Ordn" );
	var idTrgt = charIDToTypeID( "Trgt" );
	ref7.putEnumerated( idLyr, idOrdn, idTrgt );
	list4.putReference( ref7 );
	desc10.putList( idnull, list4 );
	var idTglO = charIDToTypeID( "TglO" );
	desc10.putBoolean( idTglO, true );
	executeAction( idShw, desc10, DialogModes.NO );
	// reset resolution;
	activeDocument.resizeImage(undefined, undefined, theResolution, ResampleMethod.NONE);
	// close;
	app.activeDocument.close(SaveOptions.SAVECHANGES)
	};
	};
	////// get psds, tifs and jpgs from files //////
	function getFiles (theFile) {
	if (theFile.name.match(/\.(pdf|ai|jpg|tif|psb|psd)$/i)) {
	return true
	};
	};