无限级分类原理实现留言与回复功能
本留言板程序使用了无限级分类的原理，可以实现无限级留言与回复。留言列表gclist保留了留言层次空格，使留言--回复层次分明。
功能上，本程序可以实现无限级留言与回复，即对留言回复，对回复的留言回复。当然你也可以作有限制的控制，使其只对留言回复，关键是在模板代码中去掉回复的留言中的“回复该留言”即可。欢迎去拍砖！
效果图：
程序效果演示：http://w3note.com/guestbook
完整的留言程序代码下载：http://w3note.com/wblog
数据表：
-- ---------------------------- -- Table structure for `wb
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