Oh, I must have misunderstood your question. When someone edits a node you want to change the node author to the current user?
Well, you could use triggers and actions. Someone posted a simple action module to do this very thing: http://drupal.org/node/199216
When a node is edited by a different user, the node author does not change - it is still shown as the original author.
Any ideas why this could be? It happens for all content types in the system. :-(
regards,
Pete.
Peter Connolly
Technical Director
KP Direction LLC
http://www.kpdirection.com
http://www.kids-faith.com