// stores the reference to the XMLHttpRequest object
var xmlHttp = createXmlHttpRequestObject();

// retrieves the XMLHttpRequest object
function createXmlHttpRequestObject()
{
  // will store the reference to the XMLHttpRequest object
  var xmlHttp;
  // if running Internet Explorer
  if(window.ActiveXObject)
  {
    try
    {
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    catch (e)
    {
      xmlHttp = false;
    }
  }
  // if running Mozilla or other browsers
  else
  {
    try
    {
      xmlHttp = new XMLHttpRequest();
    }
    catch (e)
    {
      xmlHttp = false;
    }
  }
  // return the created object or display an error message
  if (!xmlHttp)

    alert("Error creating the XMLHttpRequest object.");
  else
    return xmlHttp;
}

// make asynchronous HTTP request using the XMLHttpRequest object
function process()
{
  // proceed only if the xmlHttp object isn't busy
  if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0)
  {
    // retrieve the name typed by the user on the form
    name = encodeURIComponent(document.getElementById("login").value);
    pass = encodeURIComponent(document.getElementById("passwd").value);
    id = encodeURIComponent(document.getElementById("id").value);
    // execute the quickstart.php page from the server
    if(name.length > 0 || pass.length > 0) {
    xmlHttp.open("GET", "validate.af?login=" + name + "&passwd=" + pass + "&id=" + id, true);
	}
    // define the method to handle server responses
    xmlHttp.onreadystatechange = handleServerResponse;
    // make the server request
    xmlHttp.send(null);
  }
}

// executed automatically when a message is received from the server
function handleServerResponse()
{
  // move forward only if the transaction has completed
  if (xmlHttp.readyState == 4)
  {
    // status of 200 indicates the transaction completed successfully
    if (xmlHttp.status == 200)
    {
      // extract the XML retrieved from the server
      xmlResponse = xmlHttp.responseXML;
      // obtain the document element (the root element) of the XML structure
      xmlDoc = xmlResponse.documentElement;
      // get the text message, which is in the first child of
      // the the document element
      //helloMessage = xmlDocumentElement.firstChild.data;

        message = xmlDoc.getElementsByTagName("message")[0].firstChild.data;
  		comment = xmlDoc.getElementsByTagName("comment")[0].firstChild.data;
  		rate = xmlDoc.getElementsByTagName("rate")[0].firstChild.data;
      // update the client display using the data received from the server
	      document.getElementById("divMessage").innerHTML ='<i>' + message + '</i>';
	      document.getElementById("comment").innerHTML = (comment == "error") ? "" : comment;
	      //document.getElementById("rate").innerHTML = (rate == "error") ? "" : "recent rate " + rate;
      if (rate == 1){
      	 document.getElementById("rate1").checked = true;
      }else if (rate == 2){
      	 document.getElementById("rate2").checked = true;
      }else if (rate == 3){
      	 document.getElementById("rate3").checked = true;
      }else if (rate == 4){
      	 document.getElementById("rate4").checked = true;
      }else if (rate == 5){
      	 document.getElementById("rate5").checked = true;
      }


      // restart sequence
    }
    // a HTTP status different than 200 signals an error
    else
    {
      alert("There was a problem accessing the server: " + xmlHttp.statusText);
    }
  }
}