/server irc.server1.com -j #autojoin1,#autojoin2,#autojoin3
/server -m irc.server2.com -j #autojoin4,#autojoin5,#autojoin6
Replace as needed. Make sure there is a -m on the second, and that channels are seperated by commas and not by spaces . Just putt hat in your perform, and your good 2 go
