<script type="text/javascript">
var XMLHttpRequestObject1 = null;
var XMLHttpRequestObject2 = null;

try{
  XMLHttpRequestObject1 = new XMLHttpRequest();
  XMLHttpRequestObject2 = new XMLHttpRequest();
}
catch(e){
  try{
    XMLHttpRequestObject1 =  new ActiveXObject("Microsoft.XMLHTTP");
    XMLHttpRequestObject2 =  new ActiveXObject("Microsoft.XMLHTTP");
  }
  catch(e){
  }
}

function startRequest1()
{
  if(XMLHttpRequestObject1){
    var btn1 = document.getElementById("btn1");
    btn1.disabled = true;
    XMLHttpRequestObject1.open("GET", "http://localhost/dane1.php");
    XMLHttpRequestObject1.onreadystatechange = function()
    {
      if (XMLHttpRequestObject1.readyState == 4){
        if(XMLHttpRequestObject1.status == 200){
          tekst = XMLHttpRequestObject1.responseText;
          var pt1 = document.getElementById("pt1");
          pt1.innerHTML = tekst;
        }
        btn1.disabled = false;
      }
    }
    XMLHttpRequestObject1.send(null);
  }
}

function startRequest2()
{
  if(XMLHttpRequestObject2){
    var btn2 = document.getElementById("btn2");
    btn2.disabled = true;
    XMLHttpRequestObject2.open("GET", "http://localhost/dane2.php");
    XMLHttpRequestObject2.onreadystatechange = function()
    {
      if (XMLHttpRequestObject2.readyState == 4){
        if(XMLHttpRequestObject2.status == 200){
          tekst = XMLHttpRequestObject2.responseText;
          var pt2 = document.getElementById("pt2");
          pt2.innerHTML = tekst;
        }
        btn2.disabled = false;
      }
    }
    XMLHttpRequestObject2.send(null);
  }
}
</script>