Morten Wang - 2002-09-17

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Me and others have written several articles about this
subject, containing various versions of the collapse/expand
all functionality:

http://groups.yahoo.com/group/tree_menu/message/1081
http://groups.yahoo.com/group/tree_menu/message/1003
http://groups.yahoo.com/group/tree_menu/message/997
http://groups.yahoo.com/group/tree_menu/message/1060