how to start tomcat on port 80 w/o being root?

[Trevor Little]

I want to create a tomcat user and start tomcat on port 80 under linux. 
I know only root can use ports below 1024.  However, apache can run as
someone other than root and still use port 80.  I want to do something
similar.  I know to change the ports settings on server.xml.

Thanks