addListGroup("vehicles", "car-models");

addOption("car-models", "Select a maker", "");
addOptGroup("car-models", "Import");
  addList("car-models", "Toyota", "Toyota", "Toyota's");
  addList("car-models", "Honda", "Honda", "Honda's");
endOptGroup("car-models");

addOptGroup("car-models", "Domestic");
  addList("car-models", "Chrysler", "Chrysler", "Chrysler's");
  addList("car-models", "Ford", "Ford", "Ford's");
endOptGroup("car-models");

addOption("Toyota's", "Select a Toyota vehicle", "");
addOptGroup("Toyota's", "Cars");
  addOption("Toyota's", "Avalon", "Avalon");
  addOption("Toyota's", "Camry", "Camry");
  addOption("Toyota's", "Celica", "Celica");
  addOption("Toyota's", "Corolla", "Corolla");
  addOption("Toyota's", "ECHO", "ECHO");
  addOption("Toyota's", "Matrix", "Matrix");
  addOption("Toyota's", "MR2 Spyder", "MR2 Spyder");
  addOption("Toyota's", "Prius", "Prius");
endOptGroup("Toyota's");

addOptGroup("Toyota's", "SUVs/Van");
  addOption("Toyota's", "4Runner", "4Runner");
  addOption("Toyota's", "Highlander", "Highlander");
  addOption("Toyota's", "Land Cruiser", "Land Cruiser");
  addOption("Toyota's", "RAV4", "RAV4");
  addOption("Toyota's", "Sequoia", "Sequoia");
  addOption("Toyota's", "Sienna", "Sienna");
endOptGroup("Toyota's");

addOptGroup("Toyota's", "Trucks");
  addOption("Toyota's", "Tacoma", "Tacoma");
  addOption("Toyota's", "Tundra", "Tundra");
endOptGroup("Toyota's");

addOption("Honda's", "Select a Honda vehicle", "");
addOptGroup("Honda's", "Cars");
  addOption("Honda's", "Accord Sedan", "Accord Sedan");
  addOption("Honda's", "Accord Coupe", "Accord Coupe");
  addOption("Honda's", "Civic Sedan", "Civic Sedan");
  addOption("Honda's", "Civic Coupe", "Civic Coupe");
  addOption("Honda's", "Civic Hybrid", "Civic Hybrid");
  addOption("Honda's", "Civic Si", "Civic Si");
  addOption("Honda's", "Civic GX", "Civic GX");
  addOption("Honda's", "Insight", "Insight");
  addOption("Honda's", "S2000", "S2000");
endOptGroup("Honda's");

addOptGroup("Honda's", "SUVs/Van");
  addOption("Honda's", "CR-V", "CR-V");
  addOption("Honda's", "Pilot", "Pilot");
  addOption("Honda's", "Odyssey", "Odyssey");
endOptGroup("Honda's");

addOption("Chrysler's", "Select a Chrysler vehicle", "");
addOptGroup("Chrysler's", "Cars");
  addOption("Chrysler's", "300M", "300M");
  addOption("Chrysler's", "PT Cruiser", "PT Cruiser");
  addOption("Chrysler's", "Concorde", "Concorde");
  addOption("Chrysler's", "Sebring Coupe", "Sebring Coupe");
  addOption("Chrysler's", "Sebring Sedan", "Sebring Sedan");
  addOption("Chrysler's", "Sebring Convertible", "Sebring Convertible");
endOptGroup("Chrysler's");

addOptGroup("Chrysler's", "Cars");
  addOption("Chrysler's", "Town & Country", "Town & Country");
  addOption("Chrysler's", "Voyager", "Voyager");
endOptGroup("Chrysler's");

addOption("Ford's", "Select a Ford vehicle", "");
addOptGroup("Ford's", "Cars");
  addOption("Ford's", "ZX2", "ZX2");
  addOption("Ford's", "Focus", "Focus");
  addOption("Ford's", "Taurus", "Taurus");
  addOption("Ford's", "Crown Victoria", "Crown Victoria");
  addOption("Ford's", "Mustang", "Mustang");
  addOption("Ford's", "Thunderbird", "Thunderbird");
endOptGroup("Ford's");

addOptGroup("Ford's", "SUVs/Van");
 addOption("Ford's", "Escape", "Escape");
 addOption("Ford's", "Explorer", "Explorer");
 addOption("Ford's", "Expedition", "Expedition");
 addOption("Ford's", "Excursion", "Excursion");
 addOption("Ford's", "Windstar", "Windstar");
 addOption("Ford's", "Econoline", "Econoline");
endOptGroup("Ford's");

addOptGroup("Ford's", "Trucks");
 addOption("Ford's", "Ranger", "Ranger");
 addOption("Ford's", "F-150", "F-150");
 addOption("Ford's", "F-250", "F-250");
 addOption("Ford's", "F-350", "F-350");
endOptGroup("Ford's");