http://www.baidu.com/s?bs=%B1%BB%CB%C0%CB%F8+%D4%DA+%CB%C0%D7%CA%D4%B4&f=8&wd=%B1%BB%CB%C0%CB%F8+%D4%DA+%CB%F8%D7%CA%D4%B4&inputT=1273
http://blog.csdn.net/laers/archive/2007/12/07/1922215.aspx