on *:START:{ server whatever | server whatever }
on *:CONNECT:{
  if ($nick != desired) { nick desired }
  .timer 1 3 connjoin
}
alias connjoin {
    if ($network == net1) { join -n chan1,2,3 }
  elseif ($network == net2) { join -n chan4,5,6 }
}

on *:JOIN:#channel:{ if ($nick == $me) { msg $chan whatever } }