function checkBoxes(varForm, varLocation)
{
  switch (varLocation)
  {
    case "GB":{
      if(varForm.chkExtentGB.checked)
      {
        varForm.chkExtentUK.checked = false;
        varForm.chkExtentEngland.checked = false;
        varForm.chkExtentScotland.checked = false;
        varForm.chkExtentWales.checked = false;
        varForm.chkExtentEnglandAndWales.checked = false;
        varForm.chkExtentNorthernIreland.checked = false;
      }
      break;
    }
    case "UK":{
      if(varForm.chkExtentUK.checked)
      {
        varForm.chkExtentGB.checked = false;
        varForm.chkExtentEngland.checked = false;
        varForm.chkExtentScotland.checked = false;
        varForm.chkExtentWales.checked = false;
        varForm.chkExtentEnglandAndWales.checked = false;
        varForm.chkExtentNorthernIreland.checked = false;
      }
      break;
    }
    case "EW":{
      if(varForm.chkExtentEnglandAndWales.checked)
      {
        varForm.chkExtentUK.checked = false;
        varForm.chkExtentGB.checked = false;
        varForm.chkExtentEngland.checked = false;
        varForm.chkExtentWales.checked = false;
      }
      break;
    }
    case "E":{
      if(varForm.chkExtentEngland.checked)
      {
        varForm.chkExtentUK.checked = false;
        varForm.chkExtentGB.checked = false;
        varForm.chkExtentEnglandAndWales.checked = false;
      }
      break;
    }
    case "W":{
      if(varForm.chkExtentWales.checked)
      {
        varForm.chkExtentUK.checked = false;
        varForm.chkExtentGB.checked = false;
        varForm.chkExtentEnglandAndWales.checked = false;
      }
      break;
    }
    case "S":{
      if(varForm.chkExtentScotland.checked)
      {
        varForm.chkExtentUK.checked = false;
        varForm.chkExtentGB.checked = false;
      }
      break;
    }
    case "NI":{
      if(varForm.chkExtentNorthernIreland.checked)
      {
        varForm.chkExtentUK.checked = false;
        varForm.chkExtentGB.checked = false;
      }
      break;
    }
  }
}