Undo chmod u+s `which kppp`

From: Bill Dika (bdikaca_at_yahoo.com)
Date: 08/28/03 

Date: 28 Aug 2003 05:56:12 -0700

I am using RedHat Linux 9 and entered the following commands in order
to get non-root dialup:

chmod u+s `which kppp`
chmod u+s `which pppd`

Now I get no response when I choose the Kppp item from the KDE menu in
RedHat and cannot start kppp except as root. This is the opposite of
what I was trying to achieve. When I type the command for kppp from a
terminal as a non root user I also get no response. Before I entered
the above commands the same action would ask me for my root password
and then proceed to start up kppp

How do I undo the above commands and restore the menu response in KDE?

Any help would be much appreciated.

Regards,
Bill Dika