var xmlhttp;
function GetXmlHttpObject()
{
if (window.XMLHttpRequest)
  {
  // code for IE7+, Firefox, Chrome, Opera, Safari
  return new XMLHttpRequest();
  }
if (window.ActiveXObject)
  {
  // code for IE6, IE5
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
return null;
}

function podmodely()
{

var select_model = document.getElementById("model").value;

xmlhttp=GetXmlHttpObject();
if (xmlhttp==null)
  {
 alert ("Váš prohlížeč je zastaralý.");
 return;
  }
var url="ajax_podmodel.php";
url=url+"?px="+select_model;
url=url+"&sid="+Math.random();
xmlhttp.onreadystatechange=stateChanged;
xmlhttp.open("GET",url,true);
//xmlhttp.setRequestHeader("Content-Type","text/html; charset=windows-1250"); 
xmlhttp.send(null);
}

function stateChanged()
{
if (xmlhttp.readyState==4 && xmlhttp.responseText!=null)
{
if (xmlhttp.status == 200) {
document.getElementById("podmodely").innerHTML=xmlhttp.responseText;
}
}
}

function motory()
{

var select_motor = document.getElementById("podmodel").value;

xmlhttp_m=GetXmlHttpObject();
if (xmlhttp_m==null)
  {
 alert ("Váš prohlížeč je zastaralý.");
 return;
  }
var url="ajax_motor.php";
url=url+"?py="+select_motor;
url=url+"&sid="+Math.random();
xmlhttp_m.onreadystatechange=stateChanged_m;
xmlhttp_m.open("GET",url,true);
//xmlhttp.setRequestHeader("Content-Type","text/html; charset=windows-1250"); 
xmlhttp_m.send(null);
}

function stateChanged_m()
{
if (xmlhttp_m.readyState==4 && xmlhttp_m.responseText!=null)
{
if (xmlhttp_m.status == 200) {
document.getElementById("motor").innerHTML=xmlhttp_m.responseText;
}
}
}