// JavaScript Document
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 getServerText(xid,qta,a) {
  var myurl = 'core_ecom.php';
  myRand = parseInt(Math.random()*999999999999999);

  var modurl = myurl+"?id="+ xid +"&qta="+qta+"&a="+a+"&rand="+myRand;  
  http.open("GET", modurl, true);
  http.onreadystatechange = useHttpResponse;
  http.send(null);
}

function useHttpResponse() {
   if (http.readyState == 4) {
    if(http.status == 200) { 
      var mytext = http.responseText;
      document.getElementById('carrello').innerHTML = mytext;
    }
  } else {
  document. getElementById('carrello').innerHTML = "<img src='../../images/ajax-loader.gif'>";
  }
}