function PermitSubmit(form)
{
   // Check for sensible combination
   if ( form.elements["search_county"].value == "Dublin" && form.elements["search_postcode"].value == "")
   {
      alert("Please select a postcode area for Dublin.");
      return false;
   }
   if ( form.elements["search_county"].value != "Dublin" && form.elements["search_postcode"].value != "")
   {
      alert("Only select a postcode area for Dublin - use n/a if you are in another county.");
      return false;
   }
   return true;
}