function HttpRequest(url,target) {
  // native XMLHttpRequest object
//  document.getElementById(target).innerHTML = 'ArteSacro';
  if (window.XMLHttpRequest) {
    req = new XMLHttpRequest();
    req.onreadystatechange = function() {HttpRequestOk(target);};
    req.open("GET", url, true);
    req.send(null);
    // IE/Windows ActiveX version
  } else if (window.ActiveXObject) {
    req = new ActiveXObject("Microsoft.XMLHTTP");
    if (req) {
      req.onreadystatechange = function() {HttpRequestOk(target);};
      req.open("GET", url, true);
      req.send();
    }
  }
  //setTimeout("HttpRequest('pagina.asp','div_destino')", 10000);
}

function HttpRequestOk(target) {
// only if req is "loaded"
if (req.readyState == 4) {
  // only if "OK"
  if (req.status == 200 || req.status == 304)
    {
      results = req.responseText;
      document.getElementById(target).innerHTML = results;
    } else {
      document.getElementById(target).innerHTML="HttpRequest error:\n" + req.statusText;
    }
  }
}