function change_country() {
  var country = document.forms[0].state.value;
  document.forms[0].county.options.length = 0;

  switch (country) {
    case "EN":
      england();
      break;
    case "SC":
      scotland();
      break;
    case "WS":
      wales();
      break;
    case "NI":
      northernireland();
      break;
    default :
      england();
      break;
   }
}

function england() {
  document.forms[0].county.options[0] = new Option("Bedfordshire", "Bedfordshire");
  document.forms[0].county.options[1] = new Option("Berkshire", "Berkshire");
  document.forms[0].county.options[2] = new Option("Bristol", "Bristol");
  document.forms[0].county.options[3] = new Option("Buckinghamshire", "Buckinghamshire");
  document.forms[0].county.options[4] = new Option("Cambridgeshire", "Cambridgeshire");
  document.forms[0].county.options[5] = new Option("Cheshire", "Cheshire");
  document.forms[0].county.options[6] = new Option("Cornwall", "Cornwall");
  document.forms[0].county.options[7] = new Option("Cumbria", "Cumbria");
  document.forms[0].county.options[8] = new Option("Derbyshire", "Derbyshire");
  document.forms[0].county.options[9] = new Option("Devon", "Devon");
  document.forms[0].county.options[10] = new Option("Dorset", "Dorset");
  document.forms[0].county.options[11] = new Option("Durham", "Durham");
  document.forms[0].county.options[12] = new Option("East Riding of Yorkshire", "East Riding of Yorkshire");
  document.forms[0].county.options[13] = new Option("East Sussex", "East Sussex");
  document.forms[0].county.options[14] = new Option("Essex", "Essex");
  document.forms[0].county.options[15] = new Option("Gloucestershire", "Gloucestershire");
  document.forms[0].county.options[16] = new Option("Greater London", "Greater London");
  document.forms[0].county.options[17] = new Option("Greater Manchester", "Greater Manchester");
  document.forms[0].county.options[18] = new Option("Guernsey", "Guernsey");
  document.forms[0].county.options[19] = new Option("Hampshire", "Hampshire");
  document.forms[0].county.options[20] = new Option("Herefordshire", "Herefordshire");
  document.forms[0].county.options[21] = new Option("Hertfordshire", "Hertfordshire");
  document.forms[0].county.options[22] = new Option("Isle of Wight", "Isle of Wight");
  document.forms[0].county.options[23] = new Option("Isle of Man", "Isle of Man");
  document.forms[0].county.options[24] = new Option("Jersey", "Jersey");
  document.forms[0].county.options[25] = new Option("Kent", "Kent");
  document.forms[0].county.options[26] = new Option("Lancashire", "Lancashire");
  document.forms[0].county.options[27] = new Option("Leicestershire", "Leicestershire");
  document.forms[0].county.options[28] = new Option("Lincolnshire", "Lincolnshire");
  document.forms[0].county.options[29] = new Option("Merseyside", "Merseyside");
  document.forms[0].county.options[30] = new Option("Middlesex", "Middlesex");
  document.forms[0].county.options[31] = new Option("Norfolk", "Norfolk");
  document.forms[0].county.options[32] = new Option("North Yorkshire", "North Yorkshire");
  document.forms[0].county.options[33] = new Option("Northamptonshire", "Northamptonshire");
  document.forms[0].county.options[34] = new Option("Northumberland", "Northumberland");
  document.forms[0].county.options[35] = new Option("Nottinghamshire", "Nottinghamshire");
  document.forms[0].county.options[36] = new Option("Oxfordshire", "Oxfordshire");
  document.forms[0].county.options[37] = new Option("Rutland", "Rutland");
  document.forms[0].county.options[38] = new Option("Shropshire", "Shropshire");
  document.forms[0].county.options[39] = new Option("Somerset", "Somerset");
  document.forms[0].county.options[40] = new Option("South Yorkshire", "South Yorkshire");
  document.forms[0].county.options[41] = new Option("Staffordshire", "Staffordshire");
  document.forms[0].county.options[42] = new Option("Suffolk", "Suffolk");
  document.forms[0].county.options[43] = new Option("Surrey", "Surrey");
  document.forms[0].county.options[44] = new Option("Tyne & Wear", "Tyne & Wear");
  document.forms[0].county.options[45] = new Option("Warwickshire", "Warwickshire");
  document.forms[0].county.options[46] = new Option("West Midlands", "West Midlands");
  document.forms[0].county.options[47] = new Option("West Sussex", "West Sussex");
  document.forms[0].county.options[48] = new Option("West Yorkshire", "West Yorkshire");
  document.forms[0].county.options[49] = new Option("Wiltshire", "Wiltshire");
  document.forms[0].county.options[50] = new Option("Worcestershire", "Worcestershire");
}

function northernireland() {
  document.forms[0].county.options[0] = new Option("County Antrim", "County Antrim");
  document.forms[0].county.options[1] = new Option("County Armagh", "County Armagh");
  document.forms[0].county.options[2] = new Option("County Down", "County Down");
  document.forms[0].county.options[3] = new Option("County Fermanagh", "County Fermanagh");
  document.forms[0].county.options[4] = new Option("County Londonderry", "County Londonderry");
  document.forms[0].county.options[5] = new Option("County Tyrone", "County Tyrone");
}

function scotland() {
  document.forms[0].county.options[0] = new Option("Aberdeen", "Aberdeen");
  document.forms[0].county.options[1] = new Option("Aberdeenshire", "Aberdeenshire");
  document.forms[0].county.options[2] = new Option("Angus", "Angus");
  document.forms[0].county.options[3] = new Option("Argyll and Bute", "Argyll and Bute");
  document.forms[0].county.options[4] = new Option("Clackmannanshire", "Clackmannanshire");
  document.forms[0].county.options[5] = new Option("Dumfries and Galloway", "Dumfries and Galloway");
  document.forms[0].county.options[6] = new Option("Dundee", "Dundee");
  document.forms[0].county.options[7] = new Option("East Ayrshire", "East Ayrshire");
  document.forms[0].county.options[8] = new Option("East Dunbartonshire", "East Dunbartonshire");
  document.forms[0].county.options[9] = new Option("East Lothian", "East Lothian");
  document.forms[0].county.options[10] = new Option("East Renfrewshire", "East Renfrewshire");
  document.forms[0].county.options[11] = new Option("Edinburgh", "Edinburgh");
  document.forms[0].county.options[12] = new Option("Falkirk", "Falkirk");
  document.forms[0].county.options[13] = new Option("Fife", "Fife");
  document.forms[0].county.options[14] = new Option("Glasgow", "Glasgow");
  document.forms[0].county.options[15] = new Option("Highland", "Highland");
  document.forms[0].county.options[16] = new Option("Inverclyde", "Inverclyde");
  document.forms[0].county.options[17] = new Option("Midlothian", "Midlothian");
  document.forms[0].county.options[18] = new Option("Moray", "Moray");
  document.forms[0].county.options[19] = new Option("North Ayrshire", "North Ayrshire");
  document.forms[0].county.options[20] = new Option("North Lanarkshire", "North Lanarkshire");
  document.forms[0].county.options[21] = new Option("Orkney Islands", "Orkney Islands");
  document.forms[0].county.options[22] = new Option("Perth and Kinross", "Perth and Kinross");
  document.forms[0].county.options[23] = new Option("Renfrewshire", "Renfrewshire");
  document.forms[0].county.options[24] = new Option("Scottish Borders", "Scottish Borders");
  document.forms[0].county.options[25] = new Option("Shetland Islands", "Shetland Islands");
  document.forms[0].county.options[26] = new Option("South Ayrshire", "South Ayrshire");
  document.forms[0].county.options[27] = new Option("South Lanarkshire", "South Lanarkshire");
  document.forms[0].county.options[28] = new Option("Stirling", "Stirling");
  document.forms[0].county.options[29] = new Option("West Dunbartonshire", "West Dunbartonshire");
  document.forms[0].county.options[30] = new Option("West Lothian", "West Lothian");
  document.forms[0].county.options[31] = new Option("Western Isles", "Western Isles");
}

function wales() {
  document.forms[0].county.options[0] = new Option("Anglesey", "Anglesey");
  document.forms[0].county.options[1] = new Option("Blaenau Gwent", "Blaenau Gwent");
  document.forms[0].county.options[2] = new Option("Bridgend", "Bridgend");
  document.forms[0].county.options[3] = new Option("Caerphilly", "Caerphilly");
  document.forms[0].county.options[4] = new Option("Cardiff", "Cardiff");
  document.forms[0].county.options[5] = new Option("Carmarthenshire", "Carmarthenshire");
  document.forms[0].county.options[6] = new Option("Ceredigion", "Ceredigion");
  document.forms[0].county.options[7] = new Option("Conwy", "Conwy");
  document.forms[0].county.options[8] = new Option("Denbighshire", "Denbighshire");
  document.forms[0].county.options[9] = new Option("Flintshire", "Flintshire");
  document.forms[0].county.options[10] = new Option("Gwynedd", "Gwynedd");
  document.forms[0].county.options[11] = new Option("Merthyr Tydfil", "Merthyr Tydfil");
  document.forms[0].county.options[12] = new Option("Monmouthshire", "Monmouthshire");
  document.forms[0].county.options[13] = new Option("Neath Port Talbot", "Neath Port Talbot");
  document.forms[0].county.options[14] = new Option("Newport", "Newport");
  document.forms[0].county.options[15] = new Option("Pembrokeshire", "Pembrokeshire");
  document.forms[0].county.options[16] = new Option("Powys", "Powys");
  document.forms[0].county.options[17] = new Option("Rhondda Cynon Taff", "Rhondda Cynon Taff");
  document.forms[0].county.options[18] = new Option("Swansea", "Swansea");
  document.forms[0].county.options[19] = new Option("Torfaen", "Torfaen");
  document.forms[0].county.options[20] = new Option("Vale of Glamorgan", "Vale of Glamorgan");
  document.forms[0].county.options[21] = new Option("Wrexham", "Wrexham");
}