function setOptions(chosen) {
var selbox = document.searchform.ship_id;
 
selbox.options.length = 0;
if (chosen == "") {
  selbox.options[selbox.options.length] = new Option('-- All Cruise Ships --','');
 
}
if (chosen == "23") {
  	selbox.options[selbox.options.length] = new Option('-- All Princess Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Star Princess', '290');
	  selbox.options[selbox.options.length] = new Option('Dawn Princess', '97');
	  selbox.options[selbox.options.length] = new Option('Grand Princess', '98');
	  selbox.options[selbox.options.length] = new Option('Regal Princess', '101');
	  selbox.options[selbox.options.length] = new Option('Sun Princess', '105');
	  selbox.options[selbox.options.length] = new Option('Golden Princess', '253');
	  selbox.options[selbox.options.length] = new Option('Coral Princess', '291');
	  selbox.options[selbox.options.length] = new Option('Pacific Princess', '341');
	  selbox.options[selbox.options.length] = new Option('Tahitian Princess', '344');
	  selbox.options[selbox.options.length] = new Option('Island Princess', '348');
	  selbox.options[selbox.options.length] = new Option('Diamond Princess', '349');
	  selbox.options[selbox.options.length] = new Option('Sapphire Princess', '406');
	  selbox.options[selbox.options.length] = new Option('Caribbean Princess', '434');
	  selbox.options[selbox.options.length] = new Option('Sea Princess', '451');
	  selbox.options[selbox.options.length] = new Option('Crown Princess', '542');
	  selbox.options[selbox.options.length] = new Option('Emerald Princess', '580');
	  selbox.options[selbox.options.length] = new Option('Royal Princess', '581');
	  selbox.options[selbox.options.length] = new Option('Ruby Princess', '678');
	}
if (chosen == "15") {
  	selbox.options[selbox.options.length] = new Option('-- All Cunard Line Ships --','');
    selbox.options[selbox.options.length] = new Option('Queen Elizabeth 2', '68');
	  selbox.options[selbox.options.length] = new Option('Queen Mary 2', '258');
	  selbox.options[selbox.options.length] = new Option('Queen Victoria', '585');
	}
if (chosen == "14") {
  	selbox.options[selbox.options.length] = new Option('-- All Crystal Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Crystal Symphony', '66');
	  selbox.options[selbox.options.length] = new Option('Crystal Serenity', '332');
	}
if (chosen == "18") {
  	selbox.options[selbox.options.length] = new Option('-- All Holland America Line Ships --','');
    selbox.options[selbox.options.length] = new Option('Amsterdam', '74');
	  selbox.options[selbox.options.length] = new Option('Maasdam', '75');
	  selbox.options[selbox.options.length] = new Option('Rotterdam', '78');
	  selbox.options[selbox.options.length] = new Option('Ryndam', '79');
	  selbox.options[selbox.options.length] = new Option('Statendam', '80');
	  selbox.options[selbox.options.length] = new Option('Veendam', '81');
	  selbox.options[selbox.options.length] = new Option('Volendam', '82');
	  selbox.options[selbox.options.length] = new Option('Zaandam', '84');
	  selbox.options[selbox.options.length] = new Option('Prinsendam', '313');
	  selbox.options[selbox.options.length] = new Option('Zuiderdam', '335');
	  selbox.options[selbox.options.length] = new Option('Oosterdam', '340');
	  selbox.options[selbox.options.length] = new Option('Westerdam', '401');
	  selbox.options[selbox.options.length] = new Option('Noordam', '547');
	  selbox.options[selbox.options.length] = new Option('Eurodam', '657');
	}
if (chosen == "24") {
  	selbox.options[selbox.options.length] = new Option('-- All Regent Seven Seas Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Seven Seas Navigator', '108');
	  selbox.options[selbox.options.length] = new Option('Paul Gauguin', '109');
	  selbox.options[selbox.options.length] = new Option('Seven Seas Mariner', '111');
	  selbox.options[selbox.options.length] = new Option('Seven Seas Voyager', '338');
	  selbox.options[selbox.options.length] = new Option('Explorer II', '645');
	}
if (chosen == "91") {
  	selbox.options[selbox.options.length] = new Option('-- All Oceania Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Regatta', '394');
	  selbox.options[selbox.options.length] = new Option('Insignia', '395');
	  selbox.options[selbox.options.length] = new Option('Nautica', '508');
	}
if (chosen == "28") {
  	selbox.options[selbox.options.length] = new Option('-- All Seabourn Cruise Line Ships --','');
    selbox.options[selbox.options.length] = new Option('Seabourn Legend', '138');
	  selbox.options[selbox.options.length] = new Option('Seabourn Pride', '139');
	  selbox.options[selbox.options.length] = new Option('Seabourn Spirit', '140');
	  selbox.options[selbox.options.length] = new Option('Seabourn Odyssey', '711');
	}
if (chosen == "29") {
  	selbox.options[selbox.options.length] = new Option('-- All Silversea Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Prince Albert II', '717');
	  selbox.options[selbox.options.length] = new Option('Silver Cloud', '147');
	  selbox.options[selbox.options.length] = new Option('Silver Shadow', '148');
	  selbox.options[selbox.options.length] = new Option('Silver Wind', '149');
	  selbox.options[selbox.options.length] = new Option('Silver Whisper', '223');
	}
if (chosen == "33") {
  	selbox.options[selbox.options.length] = new Option('-- All Windstar Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Wind Surf', '160');
	  selbox.options[selbox.options.length] = new Option('Wind Star', '162');
	  selbox.options[selbox.options.length] = new Option('Wind Spirit', '163');
	}
if (chosen == "88") {
  	selbox.options[selbox.options.length] = new Option('-- All SeaDream Yacht Club Ships --','');
    selbox.options[selbox.options.length] = new Option('SeaDream I', '385');
	  selbox.options[selbox.options.length] = new Option('SeaDream II', '386');
	}
if (chosen == "115") {
  	selbox.options[selbox.options.length] = new Option('-- All Orient Express Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Road to Mandalay', '503');
	}
if (chosen == "151") {
  	selbox.options[selbox.options.length] = new Option('-- All Azamara Cruises Ships --','');
    selbox.options[selbox.options.length] = new Option('Azamara Journey', '616');
	  selbox.options[selbox.options.length] = new Option('Azamara Quest', '652');
	}
if (chosen == "153") {
  	selbox.options[selbox.options.length] = new Option('-- All Tauck Ships --','');
    selbox.options[selbox.options.length] = new Option('Swiss Diamond', '670');
	  selbox.options[selbox.options.length] = new Option('Swiss Emerald', '671');
	  selbox.options[selbox.options.length] = new Option('Swiss Sapphire', '672');
	  selbox.options[selbox.options.length] = new Option('Nile Adventurer', '702');
	}

}