newbie question - Tomcat 4 instead of Tomcat 5 on FC4

[Bob Hartung]

Hi,
   If I am in the wrong list please advise me of such.  I am trying to 
install the MIRC server from the Radiological Society of North America. 
  This calls for java 1.4 (installed) and Tomcat 4.x.

   I am running FedoraCore4 which has Tomcat 5 installed and the MIRC 
software (a Radiology Teaching File/Research Case database product) will 
not run under Tomcat 5 at the present.  I therefore need to have Tomcat 
4 installed which I can do from the tar.gz.  However, how can I make 
sure that the Tomcat 5 installation is not called or do the tar.gz files 
usually have files I can copy to /etc/init.d to use to start the Tomcat 
4 service on boot?

   Sorry if this is a dumb question, but as a newbie I am somewhat 
overwhelmed with the terminology associated with Java in all of its clothes.

Thanks,

Bob Hartung