title: jquery event namespace beginner example
body: <p>all,
  <br>
  I am learning jquery event namespace based on <a href="http://api.jquery.com/on/#event-names" rel="nofollow">http://api.jquery.com/on/#event-names</a> 
  <br>
  However, I am still very confused about how to customize a event namespace and how to fire a customise event to selected objects. 
  <br>
  Can someone write me a good example so that I can understand how to use the event namespace better? </p>
  
  <p>Thank you. </p>