jquery ui get id of droppable element, when dropped an item

To get the id of both the draggable and the droppable elements use the following:

$('.selector').droppable({ drop: Drop });

function Drop(event, ui) {
  var draggableId = ui.draggable.attr("id");
  var droppableId = $(this).attr("id");
}

Sorry might be a little late for you but I have just started using jquery and needed the exact thing.