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You could try this...

[code]

#target photoshop;

app.displayDialogs = DialogModes.NO;

var topLevel = Folder.selectDialog("Please select top level folder");

if(topLevel != null ){

var folders =[];

folders = FindAllFolders(topLevel, folders);

folders.unshift(topLevel);

for(var z in folders){

Files = folders[z].getFiles("*.jpg");

createPresentation(folders[z]);

Files=[];

    }

}

function createPresentation(Dir){   

    var d = new ActionDescriptor(); 

    var list = new ActionList();  

    for(var a=0;a<Files.length;a++) list.putPath(Files[a]);     

    d.putList(stringIDToTypeID("filesList"), list);     

    d.putPath(stringIDToTypeID("to"), new File(Dir + "/" + decodeURI(Dir.name) + ".pdf"));    

    d.putBoolean(stringIDToTypeID("includeAnnotations"), true);  

    d.putEnumerated(stringIDToTypeID("backgroundColor"), stringIDToTypeID("backgroundColor"), stringIDToTypeID("white")); 

    d.putBoolean(stringIDToTypeID("autoAdvance"), true); 

    d.putInteger(stringIDToTypeID("autoAdvanceSeconds"), 5); 

    d.putBoolean(stringIDToTypeID("loop"), true); 

    d.putEnumerated(stringIDToTypeID("transition"), stringIDToTypeID("transition"), stringIDToTypeID("random")); 

    d.putBoolean(stringIDToTypeID("presentation"), true); 

    var d1 = new ActionDescriptor(); 

    d1.putString(stringIDToTypeID("pdfPresetFilename"), "High Quality Print"); 

    d1.putBoolean(stringIDToTypeID("pdfPreserveEditing"), true); 

    d1.putBoolean(stringIDToTypeID("pdfViewAfterSave"), false); 

    d1.putInteger(stringIDToTypeID("pdfCompressionType"), 7); 

    d.putObject(stringIDToTypeID("as"), stringIDToTypeID("photoshopPDFFormat"), d1); 

    executeAction(stringIDToTypeID("PDFExport"), d, DialogModes.NO);

};

function FindAllFolders( srcFolderStr, destArray) {

    var fileFolderArray = Folder( srcFolderStr ).getFiles();

    for ( var i = 0; i < fileFolderArray.length; i++ ) {

        var fileFoldObj = fileFolderArray[i];

        if ( fileFoldObj instanceof File ) {           

        } else {

         destArray.push( Folder(fileFoldObj) );

        FindAllFolders( fileFoldObj.toString(), destArray );

        }

    }

    return destArray;

}

[/code]