title: Google Maps API v3 - Hide markers not from the country selected
body: <p>Is it possible to hide markers that are not from a particular country? Eg I have a dropdown menu with England, Wales, Scotland etc.</p>
  <p>If the user selects Wales - the map zooms to Wales and shows all the marker within a certain radius, but I would want to have any markers that are near the Welsh border to not appear as they are not within Wales.</p>
  <p>Any ideas?</p>