anchor.diff:    var polyline; //The line
     var marker_data = new Array();
   
  +  // Given a latitude and a longitude, add a marker to the map
  +  // and the underlying HTML data structure.
     function add_marker(latitude, longitude){
       var next_pos = next_position();
       var index = next_index();
  
positive.code:     
      marker_data[marker.get('data_id')].active = false;
    }
   
    function import_data(){
      $.each(marker_data, function(index, marker){
        remove_marker(marker.marker);
  
negative.code:     add_edit_marker_to_map(coord, index);
    }
    
    // Given a marker, remove it from the map, line
    // and mark it for deletion in the database.
    function remove_marker(marker){
      //Remove it from the line and map.
      delete_from_map(marker);
  