/*
* This file is Copyright (C) 2011 Lv Hongliang. All Rights Reserved.
* please maitain the copyright information completely when you redistribute the code.
* 
* Please contact me via email honglianglv@gmail.com
* my blog: http://lifecrunch.biz
* my twitter: http://twitter.com/honglianglv
*
* It is free software; you can redistribute it and/or modify it under 
* the GNU General Public License as published by the Free Software
* Foundation; either version 1, or (at your option) any later version.
*/