Changing leagues

Is there a way to get in this league after you joined a 2004 league, how do you get out and then go in this league 2005, there both 12.50. The league I joined hasn't drafted yet?
http://forum-365.strat-o-matic.com/archivesn/
http://forum-365.strat-o-matic.com/archivesn/viewtopic.php?f=12&t=530008