SelectedLayers.jsx

var docRef = app.activeDocument;

cTID = function(s) { return app.charIDToTypeID(s); };
sTID = function(s) { return app.stringIDToTypeID(s); };

function newGroupFromLayers(doc) {
    var desc = new ActionDescriptor();
    var ref = new ActionReference();
    ref.putClass( sTID('layerSection') );
    desc.putReference( cTID('null'), ref );
    var lref = new ActionReference();
    lref.putEnumerated( cTID('Lyr '), cTID('Ordn'), cTID('Trgt') );
    desc.putReference( cTID('From'), lref);
    executeAction( cTID('Mk  '), desc, DialogModes.NO );
};

function undo() {
   executeAction(cTID("undo", undefined, DialogModes.NO));
};

function getSelectedLayers(doc) {
  var selLayers = [];
  newGroupFromLayers();

  var group = doc.activeLayer;
  var layers = group.layers;

  for (var i = 0; i < layers.length; i++) {
    selLayers.push(layers[i]);
  }

  undo();

  return selLayers.reverse();
};

var selectedLayers = getSelectedLayers(app.activeDocument);

// alert(selectedLayers);

// for( i = 0; i < selectedLayers.length; i++) {
//     selectedLayers[i].selected = true;
//     docRef.activeLayer = selectedLayers[i];
//     alert(docRef.activeLayer.name)
//  }