title: How to brighten Textbox when it is focused?
body: <p>How can I make a bright effect when a textbox is focused?</p>
  
  <p><a href="http://www.twitter.com" rel="nofollow">Twitter</a>'s login page has implemented the brightening text boxes already.</p>
  
  <p>I wonder the way to implement it.</p>
  
  <p>Any ideas? pure CSS? or some javascript to handle focus event and addClass removeClass with it?</p>
  
  <p>I prefer jQuery way of implementing javascript stuffs rather than implementing with pure javascript :)</p>