function Inint_AJAX() 
{  
  try { return new ActiveXObject("Msxml2.XMLHTTP");    } catch(e) {} //IE
  try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) {} //IE
  try { return new XMLHttpRequest();                   } catch(e) {} //Native Javascript
  alert("XMLHttpRequest not supported");
  return null;
}

function go(url)
{
  var req = Inint_AJAX();

  req.onreadystatechange = function ()
  {
    if (req.readyState == 4) 
    {
      if (req.status == 200) 
      {
        return text = req.responseText.toString();
      }
    }
  };

  req.open('GET', '?url=' + url, true);
  req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;charset=cp1251');
  req.send(null);
}