Just create a new bb code called 'container' which has overflow:auto.
Wrap the tables in that and it will create scrollbars automatically.
That's what I do on my site.
See here: http://cliptheapex.com/threads/fantasy-f1-league-2010-standings.1181/
That looks really, really , great and exactly what I was looking for. Being a coding- illiterate, not sure how to actually create a bb code?