How can I use Mac OS 10.4.11 and 10.5.5 back and forth?

I installed Mac OS 10.5.5 onto my G4 Sawtooth, which is running on an upgrade processor at 1.3 GHz and 2 GB RAM. The machine also has been running with Mac OS 10.4.11. I love both Mac OSs. But it is cumbersome to restart the machine back and forth. Is there anyway that I do not have to restart the machine for switching the Mac OSs?
Thanks.
Robert

I'll check with OWC and see what they say. I have an ACARD 6880M AEC Controller attached to two internal HD. It caused two Maxtor HD,on e after the other, click-to-death. Since that, I removed the ACARD and have been using one HD without any more "clicking" noise. I posted in the thread below about my experience. Nobody had similar experience. Nevertheless, if OWC feels that ACARD can work with both Mac OS 10.5 and 10.4 at same time, I may consider to put the ACARD back and place another HD in and see if it works.
http://discussions.apple.com/thread.jspa?threadID=1127045
Thanks.
Robert

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