getting symbol from the library folder… jsfl

I am looking for some MC I can set by "prompt" window, find it and doing some edits, but my script works only when MC which I am looking for is located in the root of the library without folder. Need some advice on how I can get an element (symbol) from the folder in the library

var result = prompt("Enter the name of MC:");
var CurrentFlaFile = an.getDocumentDOM();
var itemsArr = CurrentFlaFile.library.items;
for(var ArreysElement=0; ArreysElement<itemsArr.length; ArreysElement++){
var checkingElement = itemsArr[ArreysElement];
if(checkingElement.itemType=="movie clip" && checkingElement.name == result){
CurrentFlaFile.library.addItemToDocument({x:0, y:0}, result);
CurrentFlaFile.enterEditMode('inPlace');
CurrentFlaFile.getTimeline().addNewLayer("my_layer_ADDED");
CurrentFlaFile.exitEditMode();
CurrentFlaFile.deleteSelection();
an.trace(an.getDocumentDOM().library.items[ArreysElement].name);
}
}