// JavaScript Document
//Gets the browser specific XmlHttpRequest Object
function getXmlHttpRequestObject() {
 if (window.XMLHttpRequest) {
    return new XMLHttpRequest(); //Mozilla, Safari ...
 } else if (window.ActiveXObject) {
    return new ActiveXObject("Microsoft.XMLHTTP"); //IE
 } else {
    //Display our error message
    alert("Your browser doesn't support the XmlHttpRequest object.");
 }
}

//Our XmlHttpRequest object
var receiveReq = getXmlHttpRequestObject();
var strparam;

//Initiate the AJAX request
function makeRequest(url, param) {
//If our readystate is either not started or finished, initiate a new request
 if (receiveReq.readyState == 4 || receiveReq.readyState == 0) {
   //Set up the connection to captcha_test.html. True sets the request to asyncronous(default) 
   receiveReq.open("POST", url, true);
   //Set the function that will be called when the XmlHttpRequest objects state changes
   receiveReq.onreadystatechange = updatePage; 
	strparam = param;
   //Add HTTP headers to the request
   receiveReq.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
   receiveReq.setRequestHeader("Content-length", param.length);
   receiveReq.setRequestHeader("Connection", "close");
	
   //Make the request
   receiveReq.send(param);
 }   
}

//Called every time our XmlHttpRequest objects state changes
function updatePage() {
 //Check if our response is ready
 if (receiveReq.readyState == 4) {
   //Get a reference to CAPTCHA image
   img = document.getElementById('imgCaptcha'); 
   //Change the image
   img.src = 'content/contact/image_captcha.php?' + Math.random();

   var result = receiveReq.responseText;
   if (result == "Y") {
	   window.location = "thankyou.php";
   }
   else
   {
	   var url = 'contact.php?'+ strparam + '&results=Captcha failed. Please try again.';
	   window.location = url; 
   }
 }
}

//Called every time when form is perfomed
function getParam(theForm) {
 //Set the URL
 var url = 'content/contact/captcha.php';
 //Set up the parameters of our AJAX call
  var postStr = theForm.txtCaptcha.name + "=" + encodeURIComponent( theForm.txtCaptcha.value ) +
 "&" + theForm.name.name + "=" + encodeURIComponent( theForm.name.value ) +
 "&" + theForm.email.name + "=" + encodeURIComponent( theForm.email.value ) +
 "&" + theForm.message.name + "=" + encodeURIComponent( theForm.message.value );

 //Call the function that initiate the AJAX request
 makeRequest(url, postStr);
}