// JavaScript Document

/*
 * Returns a new XMLHttpRequest object, or false if this browser
 * doesn't support it
 */
function newXMLHttpRequest() {
  var xmlreq = false;
  if (window.XMLHttpRequest) {
    // Create XMLHttpRequest object in non-Microsoft browsers
    xmlreq = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    // Create XMLHttpRequest via MS ActiveX
    try {
      // Try to create XMLHttpRequest in later versions
      // of Internet Explorer
      xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e1) {
      // Failed to create required ActiveXObject
      try {
        // Try version supported by older versions
        // of Internet Explorer
        xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e2) {
        // Unable to create an XMLHttpRequest with ActiveX
      }
    }
  }
  return xmlreq;
}

function getReadyStateHandler(req, responseXmlHandler) {
  return function () {
	// If the request's status is "complete"
	if (req.readyState == 4) {
	  // Check that a successful server response was received
	  if (req.status == 200) {
		// Pass the XML payload of the response to the 
		// handler function
		responseXmlHandler(req.responseXML);
	  } else {
		// An HTTP problem has occurred
		return "HTTP error: " + req.status;
	  }
	}
  }
}