var prevCountry=null;
var prevCountryTitle=null;

function showCountry(countryId)
{
  var curCountry=document.getElementById(countryId);
  var countryTitle=document.getElementById(countryId+"_title");

  if(prevCountry!=null)
  {
    prevCountry.style.visibility="hidden";
    prevCountryTitle.className="";
  }
  prevCountry=curCountry;
  prevCountryTitle=countryTitle;
  curCountry.style.visibility="visible";
  document.getElementById("Samara").style.visibility="visible";
  countryTitle.className="current";
}