function PopulateSubRegions(selected_subregion)
{
  var All = Array('All');
  var Northland = Array('All', 'Cape Reinga', 'Dargaville', 'Kaikohe', 'Kaitaia', 'Kawakawa', 'Kerikeri', 'Mangawhai', 'Mangonui', 'Maungaturoto', 'Opononi', 'Paihia', 'Ruakaka', 'Russell', 'Towai', 'Waipu', 'Whangarei', 'Whangaroa');
  var Auckland = Array('All', 'Auckland Central', 'Auckland East', 'Auckland North', 'Auckland South', 'Auckland West');
  var TheCoromandel = Array('All', 'Colville', 'Cooks Beach', 'Coromandel', 'Hahei', 'Hikutaia', 'Hot Water Beach', 'Matarangi', 'Onemana', 'Opito', 'Opoutere', 'Pauanui', 'Tairua', 'Tapu', 'Te Puru', 'Thames', 'Whangamata', 'Whangapoua', 'Whitianga');
  var Waikato = Array('All', 'Awakino', 'Cambridge', 'Glen Massey', 'Hamilton', 'Huntly', 'Kerepehi', 'Matamata', 'Meremere', 'Morrinsville', 'Ngaruawahia', 'Ngatea', 'Otorohanga', 'Paeroa', 'Piopio', 'Putaruru', 'Raglan', 'Taupo', 'Te Aroha', 'Te Awamutu', 'Te Kauwhata', 'Te Kuiti', 'Te Poi', 'Tirau', 'Tokoroa', 'Turua', 'Waharoa', 'Waihi', 'Waihi East', 'Waikino', 'Waipa', 'Waitakaruru', 'Waitomo', 'Whiritoa');
  var BayofPlenty = Array('All', 'Aongatete', 'Athenree', 'Katikati', 'Kawerau', 'Lower Kaimai', 'Maketu', 'Mt Maunganui', 'Omokoroa', 'Opotiki', 'Rotorua', 'Tauranga', 'Te Puke', 'Waihi Beach', 'Whakatane');
  var HawkesBayGisborne = Array('All', 'Gisborne', 'Hastings', 'Havelock North', 'Napier', 'Ruatoria', 'Tokomaru Bay ', 'Tolaga Bay', 'Waipukurau', 'Wairoa');
  var Taranaki = Array('All', 'Eltham', 'Hawera', 'Mokau', 'New Plymouth', 'Opunake', 'Stratford', 'Waitara', 'Yarrow Stadium');
  var ManawatuWanganui = Array('All', 'Horowhenua', 'Manawatu', 'Mangatainoka', 'Palmerston North', 'Rangitikei', 'Ruapehu', 'Tararua', 'Wanganui');
  var WellingtonRegion = Array('All', 'Carterton', 'Featherston', 'Greytown', 'Kahutara', 'Kapiti Coast', 'Lower Hutt', 'Martinborough', 'Masterton', 'Porirua', 'Upper Hutt', 'Wellington');
  var NelsonTasman = Array('All', 'Golden Bay', 'Motueka', 'Murchison', 'Nelson', 'Richmond');
  var WestCoast = Array('All', 'Granity', 'Greymouth', 'Hokitika', 'Kumara', 'Reefton', 'Westport');
  var Marlborough = Array('All', 'Blenheim', 'Marlborough Sounds', 'Picton', 'Renwick');
  var Canterbury = Array('All', 'Ashburton', 'Ashley Gorge', 'Banks Peninsula', 'Christchurch', 'Hurunui', 'Kaikoura', 'Mackenzie', 'Selwyn', 'Springfield', 'Timaru', 'Waimakariri', 'Waimate');
  var Otago = Array('All', 'Alexandra', 'Arrowtown', 'Balclutha', 'Clyde', 'Cromwell', 'Dunedin', 'Lawrence', 'Luggate', 'Milton', 'Mosgiel', 'Oamaru', 'Queenstown', 'Ranfurly', 'Roxburgh', 'Waitaki', 'Wanaka');
  var Southland = Array('All', 'Bluff', 'Edendale', 'Gore', 'Invercargill', 'Lumsden', 'Mataura', 'Milford Sound', 'Otautau', 'Riverton', 'Stewart Island', 'Te Anau', 'Tokanui', 'Tuatapere', 'Waikaka', 'Winton');
  
  RemoveSubRegions();
 
  var selected_region = document.eventform.region.value.replace(/ /g, "").replace(/\//g, "");
  document.eventform.subregion.disabled = (selected_region == "All");
 
  var region = eval(selected_region);
  
  var i;
  for (i = 0; i < region.length; i++)
  {
    document.eventform.subregion.options[i] = new Option(region[i], region[i]);
    
    if (selected_subregion == region[i])
      document.eventform.subregion.options[i].selected = true;
  }
}

function RemoveSubRegions()
{
  var i;
  var length = document.eventform.subregion.options.length;
  for (i = length - 1; i >= 0; i--)
  {
    document.eventform.subregion.remove(i);
  }
}