// 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;
     }
} else { 
     // if running Mozilla or other browsers
     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(name) {
     
     // 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
     
          // execute the quickstart.php page from the server
          xmlHttp.open("GET", "quickstart.php?name=" + name, true);
          
          
               
          // define the method to handle server responses
          xmlHttp.onreadystatechange = handleServerResponse;
          // make the server request
          xmlHttp.send(null);
     } else
          // if the connection is busy, try again after one second
          setTimeout('process()', 1000);
}


// 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
               xmlDocumentElement = xmlResponse.documentElement;
          
               // get the text message, which is in the first child of
          
               // the the document element
               helloMessage = xmlDocumentElement.firstChild.data;
               
               // update the client display using the data received from the server
               document.getElementById("vyberokres").innerHTML = zapisform(helloMessage)
                                             
          // restart sequence
    }
    // a HTTP status different than 200 signals an error
    else
    {
      alert("There was a problem accessing the server: " +
xmlHttp.statusText);
    }
  }
}