function show(id) {
	document.getElementById(id).style.visibility = "visible";
	document.getElementById(id).style.display = "block";
}

function hide(id) {
	document.getElementById(id).style.visibility = "hidden";
	document.getElementById(id).style.display = "none";
}

function getThirdLevelDomain() { 
  var q = window.location.href;
  var i = q.indexOf("cepone.net");
  var thirdLevelDomain = ""
  
  if (i == -1) {
    return "";
  }
  
  if(q.substr(i-1,1) == ".")
	  thirdLevelDomain = q.substr(7, i-8); // 7 - na odstrizeni http://, to druhe je vypocet delky zalozeny na te predchozi sedmicce
  if(thirdLevelDomain == "www")
	  thirdLevelDomain = ""
  
  return thirdLevelDomain; 
}