Code:
ON *:START:{
  /unsetall
  /set %default_nick [NICK]
  /server irc.server1.net $rand(6660,6666)
  /server -m irc.server2.net $rand(6660,6666)
  /server -m irc.server3.net $rand(6660,6666)
  /server -m irc.server4.net $rand(6660,6666)
}

ON 1:CONNECT:{
  /nick %default_nick
  /ghost

  /timerGhost_In_ $+ $network 0 5 /ghost
  /timerJoin_Channels_In_ $+ $network 0 1 /joinChannels %default_nick
}

/ghost {
  if ($me == %default_nick) /timerGhost_In_ $+ $network off
  else /ns ghost %default_nick [password]
}

/joinChannels {
  if ($me == $1) {
    /timerJoin_Channels_In_ $+ $network off
    if ($network == server1) /join #chan1,#chan2
    if ($network == server2) /join #chan3
    if ($network == server3) /join #chan4,#chan5,#chan6
  }
}