var xhr;
function sendRequest()      {
  if (window.XMLHttpRequest)  {
    xhr = new XMLHttpRequest()  ;
    var info = document.getElementById('info').value ;    
    var url = "lab5_F05.php" ;
    var data = "info=" + encodeURIComponent(info) ;
    xhr.onreadystatechange = handleResponse ;
    xhr.open("POST", url, true);
    xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded") ;
    xhr.send(data);
  } else {
    return (null) ;
  }
}

function handleResponse()      {
    myDiv = document.getElementById("MyDivElement");
    if (xhr.readyState == 4) {
         if ( xhr.status == 200 )  {
             response = xhr.responseText;
             myDiv.innerHTML += "Status zadania: 4 (zakonczony)<br/>" ;
             myDiv.innerHTML += response + "<br/>" ;
             myDiv.innerHTML += "<pre>" + xhr.getAllResponseHeaders() + "</pre><br />" ;
         }
    }  
}