Batch "Print to .pdf" illustrator script

I have a script that runs a batch "save as" with preset dialog box on all open tabs/files, but was wondering if someone could tweek it to batch "print to .pdf" with preset dialog box on all open tabs/files?

Here is my current script:

var w = new Window("dialog", "Choose a Preset");
var dropdownlist = w.add("dropdownlist", undefined, app.PDFPresetsList);
dropdownlist.preferredSize.width = 200;
dropdownlist.selection = 0;
var choice = dropdownlist.selection;
dropdownlist.onChange = function () {
choice = dropdownlist.selection;
};
var button = w.add("button", undefined, "OK");
button.onClick = function () {
saveDocsAsPDF(choice);
w.close();
};
w.show();

function saveDocsAsPDF(choice) {
// original SaveDocsAsPDF script
try {
if (app.documents.length > 0 ) {
var destFolder = null;
destFolder = Folder.selectDialog('Select folder for PDF files.', '~');
if (destFolder != null) {
var options, i, sourceDoc, targetFile;
options = getOptions();
for ( i = 0; i < app.documents.length; i++ ) {
sourceDoc = app.documents[i];
targetFile = getTargetFile(sourceDoc.name, '.pdf', destFolder);
sourceDoc.saveAs( targetFile, options );
}
alert('Documents saved as PDF');
}
} else {
throw new Error('There are no document open!');
}
} catch(e) {
alert( e.message, "Script Alert", true);
}
function getOptions() {
var options = new PDFSaveOptions();
options.pDFPreset = choice;
return options;
}
function getTargetFile(docName, ext, destFolder) {
var newName = "";
if (docName.indexOf('.') < 0) {
newName = docName + ext;
} else {
var dot = docName.lastIndexOf('.');
newName += docName.substring(0, dot);
newName += ext;
}
var myFile = new File( destFolder + '/' + newName );
if (myFile.open("w")) {
myFile.close();
}
else {
throw new Error('Access is denied');
}
return myFile;
}
}