function getXMLHTTPRequest() {
try {
req = new XMLHttpRequest();
} catch(err1) {
  try {
  req = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (err2) {
    try {
    req = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (err3) {
      req = false;
    }
  }
}
return req;
}

var http = getXMLHTTPRequest();

function af(id) {
  var myurl = 'convertor.php';
  var valdin = document.getElementById('val1').selectedIndex;
	var valdin2 = document.getElementById('val1')[valdin].value;  
  
  var valin = document.getElementById('val2').selectedIndex;
	var valin2 = document.getElementById('val2')[valin].value;
  
  var modurl = myurl+"?id="+id+"&din="+valdin2+"&in="+valin2+"&r="+new Date().getTime();
  http.open("get", modurl, true);
  http.onreadystatechange = useHttpResponse;
  http.send(null);
}

function useHttpResponse() {
   if (http.readyState == 4) {
    if(http.status == 200) {
       var suma = http.responseXML.getElementsByTagName("suma")[0];
       var suma_tva = http.responseXML.getElementsByTagName("sumatva")[0];
       var tva = http.responseXML.getElementsByTagName("tva")[0];
       document.getElementById('rezultat').value = suma.childNodes[0].nodeValue;
       document.getElementById('rezultat2').value = suma_tva.childNodes[0].nodeValue;
       document.getElementById('rezultat3').value = tva.childNodes[0].nodeValue;
    }
  }
}