function change_zone(show_all) {
  var ezid = document.forms[0].ezid.value;
  document.forms[0].eszid.options.length = 0;

  switch (ezid) {
    case "1":
      health();
      break;
    case "2":
      lifestyle();
      break;
    case "3":
      green();
      break;
    case "4":
      personalgrowth();
      break;
    case "5":
      spirit();
      break;
    case "6":
      entertainment();
      break;
    default :
      health();
      break;
   }

   if(show_all == 1) {
          if (ezid == 3) {
		  document.forms[0].eszid.options[7] = new Option("All SubZones", "0");
	  } else {
		  document.forms[0].eszid.options[6] = new Option("All SubZones", "0");
	  }
   }
}

function health() {
  document.forms[0].eszid.options[0] = new Option("Complementary & Alternative Medicine", "1");
  document.forms[0].eszid.options[1] = new Option("Natural Health Products", "2");
  document.forms[0].eszid.options[2] = new Option("Healthy Eating", "3");
  document.forms[0].eszid.options[3] = new Option("Fitness", "4");
  document.forms[0].eszid.options[4] = new Option("Natural Health Business & Trade-only", "5");
  document.forms[0].eszid.options[5] = new Option("People, Media & Organisations", "6");
}

function lifestyle() {
  document.forms[0].eszid.options[0] = new Option("Fashion & Jewellery", "7");
  document.forms[0].eszid.options[1] = new Option("Travel & Retreats", "8");
  document.forms[0].eszid.options[2] = new Option("Family & Children", "9");
  document.forms[0].eszid.options[3] = new Option("Ethical Consumerism & Fairtrade", "10");
  document.forms[0].eszid.options[4] = new Option("Natural Beauty", "11");
  document.forms[0].eszid.options[5] = new Option("People, Media & Organisations", "12");
}

function green() {
  document.forms[0].eszid.options[0] = new Option("Renewable Energy", "13");
  document.forms[0].eszid.options[1] = new Option("Environment & Conservation", "14");
  document.forms[0].eszid.options[2] = new Option("Home & Garden", "15");
  document.forms[0].eszid.options[3] = new Option("Building & Construction", "16");
  document.forms[0].eszid.options[4] = new Option("Transport & Travel", "17");
  document.forms[0].eszid.options[5] = new Option("Green Business & Trade-only", "18");
  document.forms[0].eszid.options[6] = new Option("People, Media & Organisations", "19");
}

function personalgrowth() {
  document.forms[0].eszid.options[0] = new Option("NLP, Coaching & Motivation", "20");
  document.forms[0].eszid.options[1] = new Option("Further Education", "21");
  document.forms[0].eszid.options[2] = new Option("Jobs & Careers", "22");
  document.forms[0].eszid.options[3] = new Option("Wealth & Finance", "23");
  document.forms[0].eszid.options[4] = new Option("Business Development", "24");
  document.forms[0].eszid.options[5] = new Option("People, Media & Organisations", "25");
}

function spirit() {
  document.forms[0].eszid.options[0] = new Option("Spiritual Growth", "26");
  document.forms[0].eszid.options[1] = new Option("Workshops & Retreats", "27");
  document.forms[0].eszid.options[2] = new Option("Spiritual Healing", "28");
  document.forms[0].eszid.options[3] = new Option("Intuitive Arts", "29");
  document.forms[0].eszid.options[4] = new Option("Professional Training", "30");
  document.forms[0].eszid.options[5] = new Option("People, Media & Organisations", "31");
}

function entertainment() {
  document.forms[0].eszid.options[0] = new Option("Films & Television", "32");
  document.forms[0].eszid.options[1] = new Option("Music", "33");
  document.forms[0].eszid.options[2] = new Option("Books", "34");
  document.forms[0].eszid.options[3] = new Option("Computer Games & Software", "35");
  document.forms[0].eszid.options[4] = new Option("Internet", "36");
  document.forms[0].eszid.options[5] = new Option("Magazines & Publications", "37");
}