Illustrator Scripting :: Select Items On Multiple Artboard

I have script where I select items on multiple artboard but I can't seem to get get active art board of the selected item. Is this possible?
 
each artboard has a text item and I would like them in the same position on each of their own artboards that they are already one. right now it adjusts them all to one artboard. here is what I have so far
 
doc = app.activeDocument;
for(i = 0; i < selection.length; i++){
    var firstItemPosition = doc.selection[0].position;
    doc.selection[i].position = firstItemPosition;
    var activeArtboardIndex = doc.artboards.getActiveArtboardIndex();
    alert(activeArtboardIndex);
}