function productionMethodChanged() {
  var id = this.id;
  re = /^order_item_(\d+)_production_method_nid$/.exec(id);
  id = re[1];
  var pm = optionsForProductionMethods[this.value];
  var materials = pm.materialOptions.replace(/xxxIDxxx/g, id);
  var layerThicknesses = pm.layerThicknessOptions.replace(/xxxIDxxx/g, id);

  $('#order_item_' + id + '_material_nid').after(materials).remove();
  $('#order_item_' + id + '_layer_thickness_nid').after(layerThicknesses).remove();
}