title: How to develop a mobile version website, without changing it's domain name?
body: <p>I want to develop the mobile (also includes iphone,ipad,andriod) version of my original site. But I don't want to create another sub domain like www.m.mydomain.com, can i dynamically change the document root separately for mobile version and the existing one?
  I have also noticed that, when I open facebook form iphone or any andriod mobile it opens with it's original domain name like <a href="http://www.facebook.com/" rel="nofollow">http://www.facebook.com/</a> bt when i open it from any other mobile like nokia or samsung it comes with <a href="http://m.facebook.com/" rel="nofollow">http://m.facebook.com/</a>, what is the difference between this 2?  </p>