Add a drop shadow to Text Layer

I have tried searching around, but I cant figure out how to add a drop shadow to an existing text layer. My code is shown below...

I'm using Adobe Photoshop CS5

#target photoshop

var inputFolder = Folder.selectDialog("Select a folder of documents to process");

if(inputFolder) main();

function main(){

Count = 0;

//This is where the output folder is created in this case its called PageNumbered

var PathFolder = new Folder(decodeURI(inputFolder)+"/numbered");

if (PathFolder.exists == false) PathFolder.create();

var fileList = inputFolder.getFiles();

for (var i = 0; i < 5; i++) {

        var file = fileList[0];

//////////////////////////////////////////////////////////////////////////////////////

//Change the line below to the extention of your input files ie:

//if the imput files are tif the line should be

// if (file instanceof File && file.name.match(/\.tif$/i)) {

  if (file instanceof File && file.name.match(/\.png$/i)) {

        open(file);

doc = app.activeDocument;

var startRulerUnits = preferences.rulerUnits

app.preferences.rulerUnits = Units.PIXELS

//Amend to suit.

var fontSize = 14;

var fontName = "Arial-BoldMT"; // NB: must be postscript name of font!

// This is the colour of the text in RGB

//Click foreground colour in Photoshop, choose your colour and read off the RGB values

//these can then be entered below.

var textColor = new SolidColor();

        textColor.rgb.red  = 255;

        textColor.rgb.green =255;

        textColor.rgb.blue = 255;

var newTextLayer = doc.artLayers.add();

newTextLayer.kind = LayerKind.TEXT;

newTextLayer.textItem.size = fontSize;

newTextLayer.textItem.font = fontName;

newTextLayer.textItem.contents = ++Count;

newTextLayer.textItem.color = textColor;

newTextLayer.textItem.kind = TextType.PARAGRAPHTEXT;

newTextLayer.textItem.height = fontSize;

newTextLayer.textItem.width = doc.width;

//The line below is the text position (X Y)  IE; 10 Pixels Right 10 Pixels Down

newTextLayer.textItem.position = Array(0, 12);

//  Can be RIGHTJUSTFIED LEFTJUSTIFIED CENTERJUSTIFIED

newTextLayer.textItem.justification=Justification.CENTERJUSTIFIED;

doc.flatten();

var saveFile = new File(decodeURI(PathFolder) + "/" +activeDocument.name.slice(0,-4)+ "_" + (i+1) + ".png");

//SaveForWeb(saveFile,80);

//saveForWebPNG(saveFile);

savePNG_2(saveFile);

//SavePNG(saveFile);

activeDocument.close(SaveOptions.DONOTSAVECHANGES);

preferences.rulerUnits = startRulerUnits;

  }

}

}

function SaveForWeb(saveFile,jpegQuality) {

var sfwOptions = new ExportOptionsSaveForWeb();

   sfwOptions.format = SaveDocumentType.JPEG;

   sfwOptions.includeProfile = false;

   sfwOptions.interlaced = 0;

   sfwOptions.optimized = true;

   sfwOptions.quality = jpegQuality; //0-100

activeDocument.exportDocument(saveFile, ExportType.SAVEFORWEB, sfwOptions);

}

function SavePNG(saveFile){

    pngSaveOptions = new PNGSaveOptions();

    pngSaveOptions.transparency = true;

activeDocument.saveAs(saveFile, pngSaveOptions, true, Extension.LOWERCASE);

}

function saveForWebPNG(saveFile)

{

    var opts, file;

    opts = new ExportOptionsSaveForWeb();

    opts.format = SaveDocumentType.PNG;

    opts.PNG8 = false;

    opts.quality = 100;

    opts.transparency = true;

    file = new File(saveFile);

    activeDocument.exportDocument(file, ExportType.SAVEFORWEB, opts);

}

function savePNG_2(saveFile) {

    docExportOptions = new ExportOptionsSaveForWeb

    docExportOptions.format = SaveDocumentType.PNG; //-24 //JPEG, COMPUSERVEGIF, PNG-8, BMP

    docExportOptions.transparency = true;

    docExportOptions.blur = 0.0 ;

    docExportOptions.includeProfile = false ;

    docExportOptions.interlaced = false ;

    docExportOptions.optimized = true ;

    docExportOptions.quality = 100 ;

    docExportOptions.PNG8 = false ;

    activeDocument.exportDocument (saveFile,ExportType.SAVEFORWEB,docExportOptions) ;

    }