multiple sites on jakarta apache platform

[mwhitman]

i want to host 4 websites on a single machine using apache/tomcat.
(We have a seperate Oracle server.)

Reading through the documentation it looks to me like you need a seperate 
instance of
tomcat for each virtual server.  Is this the correct?

Would 4 different instances of tomcat bog down a server.

What is the typical way to do this?

-Mike