Changing the Port on Tomcat

I'm running Linux (Debian 4).  I want to change the Listen port on Tomcat5 so that it listens on port 80.

This seems to be a matter of simply editing the server.xml file and changing the port of "8180" to "80".

But this doesn't work for some reason.  After changing the port, I reboot the system and find that tomcat is not listening on port 80.

I thought the problem might be a conflict with some other service, such as Apache, but Apache is not running.  I type netstat -ldp and find that nothing is listening on port 80.  

Anyone have an idea what the problem might be?
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The user who is starting the process might not have sufficient privileges to
listen to port 80. The user should be superuser or equivalent to do that.

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