Switch Layers Script Question

Hi I have a small script here which someone from these forums posted not too long ago... was it Noel? Either way, this script is fantastic and brings up a sub-menu to switch documents. When the menu pops up, it shows a list of all open documents in Photoshop. (I actually modified this script so all it does is switch documents instead of copying the active layer to another document.. somehow I managed it with the very basic knowledge I have )

The default document selection (the document name that is highlighted in the menu) when the list opens is "0"

I'm looking for a way to get the highlighted selection to reflect the active document instead of "0".

I think it's somewhere in this line of code:

win.NewList.selection = 0;

and I've tried changing the 0 to "actLay" and also "activeLayer" but it throws me an error message. Is there a way to get the active document as the highlighted selection? Here's the code...

var aDoc = app.activeDocument;
var AllDocs = app.documents;
var actLay = aDoc.activeLayer;

if (AllDocs.length > 1) {
var itemDoc = null;


var win = new Window("dialog","Switch Documents");
this.windowRef = win;
win.Txt1 = win.add ("statictext", undefined, "Switch to which document?");
win.NewList=win.add ("dropdownlist", undefined)
for (var m = 0; m < AllDocs.length; m++) {
win.NewList.add("item", AllDocs[m].name) 
}
win.NewList.selection = 0;
itemDoc = win.NewList.selection.actLay;

win.cancelBtn = win.add("button", undefined, "Switch");


win.cancelElement = win.cancelBtn;



win.NewList.onChange= function () {
    itemDoc = win.NewList.selection.index;    return itemDoc;    }

win.show();

app.activeDocument = app.documents[itemDoc];

app.refresh();
}