on 1:START: {
/server irc.server1.com [port] -j #channel1,#channel2,#channel3
/server -m irc.server2.org [port] -j #channel4,#channel5,#channel6,#channel7
/server -m irc.server3.net [port] -j #channel9,#channel10
}

Change the red to your preferred servers, and the green to the channels you wish to join. As far as the /server commands, make sure that every one after the first has the -m attribute. This makes it open in a new window. The [port] is optional (the default is 6667 anyways). The channels must be seperated by commas for it to work properly.

EDIT: Darnit rat.. Atleast mine's color-coded >:D