Can not change Tomcat4 to listen to :80

[Arnaud Vandyck]

I did remove Apache to try Tomcat4 standalone on port 80 but I got a 

Catalina.start: LifecycleException: null.open: java.net.BindException:
Permission denied:80

Can someone know how to avoid that? 

Thanks,

-- Arnaud
http://vbstefi60.fapse.ulg.ac.be/