// stores the reference to the XMLHttpRequest object
var xmlHttp = createXmlHttpRequestObject(); 
var lastname = "456";

// 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 ajaxprocess(){
	
  if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0){

    var forsalevalue = encodeURIComponent(document.getElementById("forsale").value);
	
	// send data to the server
	xmlHttp.open("GET", "ajax/processor.php?forsale=" + forsalevalue, true);  
	xmlHttp.onreadystatechange = handleServerResponse;
    xmlHttp.send(null);


  }else{
    // if the connection is busy, try again after one second  
    setTimeout('ajaxprocess()', 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
      //typeval = xmlDocumentElement.firstChild.firstChild.data;
	  typeval = xmlDocumentElement.getElementsByTagName("type").item(0).firstChild.data;
	  priceval = xmlDocumentElement.getElementsByTagName("pricerange").item(0).firstChild.data;

      // update the client display using the data received from the server
      document.getElementById("pricefield").innerHTML = priceval;
	  document.getElementById("typefield").innerHTML = typeval;
		
      // restart sequence
      //setTimeout('process()', 1000);
    } else {
		// a HTTP status different than 200 signals an error
      alert("There was a problem accessing the server: " + xmlHttp.statusText);
    }
  }else{
	  //alert("Transaction not completed: " + xmlHttp.readyState);
  }
}