Reference

  Guide to Using XMLHttpRequest (with Baby Steps) from WebPasties - Step #1 to Step #4
  http://www.webpasties.com/xmlHttpRequest/xmlHttpRequest_tutorial_1.html

via

  cl.pocari.org - 2005-02-27
  http://cl.pocari.org/2005-02-27.html#2005-02-27-1