var pobrany = false;

function show(obj)
{
  if(typeof obj != 'object') return;
  val = parseInt(obj[obj.selectedIndex].value);
  switch(val){
    case 0:
      return;
    case 1:
      var url = "http://localhost/art1.html";
      break;
    case 2:
      var url = "http://localhost/art2.html";
      break;
    case 3:
      var url = "http://localhost/art3.html";
      break;
    default:
      alert("Nie ma takiego artykułu.");
      return;
  }
  
  var dataDiv = document.getElementById("dataDiv");
  dataDiv.innerHTML = "Trwa ładowanie danych...";
  
  obj.disabled = true;
  pobrany = false;
  startGETRequest(url, onComplete, onEnd);
}

function onComplete(responseText, responseXML)
{
  var dataDiv = document.getElementById("dataDiv");
  dataDiv.innerHTML = responseText;
  pobrany = true;
}

function onEnd()
{
  var lista = document.getElementById("lista");
  lista.disabled = false;
  if(!pobrany){
    var dataDiv = document.getElementById("dataDiv");
    dataDiv.innerHTML = "Wybrany artykuł nie jest dostępny.";
  }
}
