Thanks for the reply, but that wasn't really what I needed help with
I know how to use the service command, I use it all the time - what I wasn't sure of was how to make it work with a different installation of Apache. I use PHP so I use Apache 1.3, not 2 as it isn't as stable. I found out how to do it in the end - I just needed to modify the scripts in the rc.d directory and comment out a function that checked to see if the httpd.conf was a 1.3 version or not (which of course it would be!). Just pointed the paths to my new apachectl and all is well now.