function showHide(elem){
   switch(elem){
      case "pais":
         var secondbox = document.getElementById("territorio");
         break;

      case "territorio":
         var secondbox = document.getElementById("pais");
         break;
   }

   var primarybox = document.getElementById(elem);


   if (primarybox.style.display == "none"){
      primarybox.style.display = "block";
      
      if (secondbox.style.display == "block")
      secondbox.style.display = "none";
   }
   else{
      primarybox.style.display = "none";
   }

}