There is no "going back" - you will need a Panther restore disk or a retail Panther install disk, and archive and install will most probably not work - i.e. you will not be able to do an archive and install of Panther 10.3 over a Tiger 10.4 install. An erase and install will be required, so if you do take such a drastic measure, be absolutely certain to back up any data, files, or programs you do not want to lose.
What problems are you having with Tiger? We may be able to help you resolve them.