I posed the question in the general discussion area of the forum and this was the response from the administrator;

forumadmin:

Playoffs are determined by overall divisional record.  In the event of a tie, head to head matchup determines the tiebreaker.  In the event of a three way tie, marginal points (+/-8 per game) are used to advance.  If the remaining two are still tied, it then goes back to head-to-head matchup.

Something to clarify that was left out above in relation to a 3 way tie between 3 teams. It still goes head to head first, so if one team beat the other two that team would be the winner. That is rare though.