preventing screen lock on lid close?

[Matthew Strait]

I'm using Ubuntu 5.04 on a Dell Latitude D600.  When I close the lid, the 
screen locks and I have to enter a password to continue.  How can I change 
this behaviour?  I just want the screen to blank when I close the lid and 
unblank when I open it.

I've spent hours searching for an answer to this to no avail, so 
apparently it's not well known.  So while I'd prefer a point-and-click 
solution, I'm willing/able to edit source code and recompile programs, so 
even information about what program(s) control the locking would be 
useful.

Thanks,
Matthew