function ajaxFunction(){
 var ajaxRequest;

try{
 ajaxRequest = new XMLHttpRequest();
 } catch (e){
 try{
 ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
 } catch (e) {
 try{
 ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
 } catch (e){
 alert("Your browser broke!");
 return false;
 }
 }
 }

ajaxRequest.onreadystatechange = function(){
 if(ajaxRequest.readyState == 4){
 var ajaxDisplay = document.getElementById('ajaxDiv');
 ajaxDisplay.innerHTML = ajaxRequest.responseText;
 document.getElementById('ajaxDiv2').innerHTML  = '';
 }
 }
 var brand_car_id = document.getElementById('brand_car_id').value;
 var queryString = "?brand_car_id=" + brand_car_id;
 ajaxRequest.open("GET", "model_cars.php" + queryString, true);
 ajaxRequest.send(null);
 }
 

 function ajaxFunction2(){
 var ajaxRequest;

try{
 ajaxRequest = new XMLHttpRequest();
 } catch (e){
 try{
 ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
 } catch (e) {
 try{
 ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
 } catch (e){
 alert("Your browser broke!");
 return false;
 }
 }
 }

ajaxRequest.onreadystatechange = function(){
 if(ajaxRequest.readyState == 4){
 var ajaxDisplay = document.getElementById('ajaxDiv2');
 ajaxDisplay.innerHTML = ajaxRequest.responseText;
 }
 }
 var model_car_id = document.getElementById('model_car_id').value;
 var queryString = "?model_car_id=" + model_car_id;
 ajaxRequest.open("GET", "year_cars.php" + queryString, true);
 ajaxRequest.send(null);
 }
 
 function ajaxFunction3(){
 var ajaxRequest;

try{
 ajaxRequest = new XMLHttpRequest();
 } catch (e){
 try{
 ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP"); 	
 } catch (e) {
 try{
 ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
 } catch (e){
 alert("Your browser broke!");
 return false;
 }
 }
 }

ajaxRequest.onreadystatechange = function(){
 if(ajaxRequest.readyState == 4){
 var ajaxDisplay = document.getElementById('ajaxDiv3');
 ajaxDisplay.innerHTML = ajaxRequest.responseText;
 document.getElementById('configurator').style.display = 'none';
 }
 }
 var year_car_id = document.getElementById('year_car_id').value;
 var queryString = "?year_car_id=" + year_car_id;
 ajaxRequest.open("GET", "speaker_cars.php" + queryString, true);
 ajaxRequest.send(null);
 }
 
 
 function ajaxFunction4(){

 document.getElementById('configurator').style.display = 'block';
 document.getElementById('ajaxDiv3').innerHTML  = '';

 }