var XMLHttpRequestObject = false;

if(window.XMLHttpRequest){
  XMLHttpRequestObject = new XMLHttpRequest();
}
else if (window.ActiveXObject){
  XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");
}

function pobierzDane()
{
  if(XMLHttpRequestObject){
    var lista = document.getElementById('lista');
    var tekstId = parseInt(lista[lista.selectedIndex].value);
    switch(tekstId){
      case 0: 
        XMLHttpRequestObject.open("GET", "listy/0.htm");
        break;
      case 1: 
        XMLHttpRequestObject.open("GET", "listy/you-mp.htm");
        break;
      case 2: 
        XMLHttpRequestObject.open("GET", "listy/otherway.htm");
        break;

      default:
        return;
    }
    
    XMLHttpRequestObject.onreadystatechange = function()
    {
      if(XMLHttpRequestObject.readyState == 4 && 
         XMLHttpRequestObject.status == 200) {
        var div = document.getElementById("div1");
        div.innerHTML = XMLHttpRequestObject.responseText;
      }
    }
    XMLHttpRequestObject.send(null);
  }
}