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http://www.itlearner.com/article/2007/3666.shtml
http://ued.alipay.com/?p=838
http://www.busfly.cn/post/160.html
http://www.cnitblog.com/yemoo/archive/2007/01/24/22275.html
http://www.blueidea.com/tech/program/2004/2273.asp