http://blog.csdn.net/yanshouke/archive/2008/12/18/3547518.aspx
http://www.cnblogs.com/flashicp/archive/2007/05/08/739245.html
http://topic.csdn.net/t/20011125/15/387668.html
http://www.xker.com/page/e2009/0116/68479.html
