starting a process on reboot

[Dana Holland]

I'm sure I'm not using the proper search times, but I just can't seem to 
find an answer to this on Google.

We're trying to set our server up to start Tomcat automatically on 
reboot.  I have the proper scripts in init.d and rc.d, and it does start 
the server, but because it's not being started as the tomcat user, it's 
not functional.  How can I make it start as the tomcat user?