[Mediawiki-l] contents of page disappearing

[Luis Borda de Agua]

I run a mediawiki site for a small group of users.

I recognize that my question is very basic, unfortunately I couldn't 
find an answer to it.

I noticed that when two users (or probably more) edit the same page at 
the same time, the entire contents of the page are totally erased when 
the user who last tries to save his/her changes clicks on "save page".

Although I can bring back one of the previous versions, this seems to 
be a major problem, and I always assumed that mediawiki had a clever 
way to deal with this (sending a warning to one of the users, for 
example).

What shall I do? Is there something I can change in some file(s)?

Thank you in advance for your help.

________________________________________________________
Luis Borda de Agua
2502 Plant Biology Building
University of Georgia
Athens GA 30602
USA
Phone: (706) 583-0943
Fax: (706) 542-1805