Select layer by name in other document

So i have 2 open documents.

They both have the same names in layers.
I wrote a script that should select a layer with the same name as the selected layer in the first document.
Here is the script. Currently the code that does not work is commented out.

var aDoc = app.activeDocument; 

var AllDocs = app.documents; 

var actLay = aDoc.activeLayer; 

if (AllDocs.length > 1) { 

var itemDoc = null; 

var win = new Window("dialog","select the same name in other document"); 

this.windowRef = win; 

win.Txt1 = win.add ("statictext", undefined, "Paste in which open document?"); 

win.NewList=win.add ("dropdownlist", undefined, AllDocs); 

win.NewList.selection = 0; 

itemDoc = win.NewList.selection.index; 

win.testBtn4 = win.add('button', [260,140,100,50], 'select the same name in other document', {name:'doding1'});

win.testBtn4.onClick = dothing;

//Get selected document from list

win.NewList.onChange= function () { 

    itemDoc = win.NewList.selection.index; 

    return itemDoc; 

    } 

//Show al items

win.show(); 

function dothing()

{

//Make the selected document the active document.

app.activeDocument = app.documents[itemDoc];

app.refresh();

//This outputs [Artlayer layername]

//alert (actLay);

//Find right layer and set active THIS DOES NOT WORK!!

//app.activeDocument.activeLayer = app.activeDocument.layers.itemByName(actLay);

win.close();

}

}

else

{ 

    alert ("No other documents open");

}