function hideElement(id){
  document.getElementById(id).style.display="none";
}

function showElement(id){
  document.getElementById(id).style.display="block";
}

function checkPl(pl){
  if(pl == "7"){
    document.getElementById("plSel").style.display="none";
  }else{
    document.getElementById("plSel").style.display="block";
  }
}

function checkPlSearch(){
  if(document.getElementById("sPlW").value == "Hledat plemeno..."){
      document.getElementById("sPlW").value = "";
  }
}