mIRC simple password generator

pass {
  if (!$2) {
    if (!$1) {
      $iif($isid,return,echo -a 4(Password4)) $regsubex($str(.,10),/./g,$chr($iif($r(0,2),$iif($r(0,1),$r(65,90),$r(97,122)),$r(48,57))))
    }
    else {
      $iif($isid,return,echo -a 4(Password4)) $regsubex($str(.,$1),/./g,$chr($iif($r(0,2),$iif($r(0,1),$r(65,90),$r(97,122)),$r(48,57))))
    }
  }
  else {
    %password = $regsubex($str(.,$1),/./g,$chr($iif($r(0,2),$iif($r(0,1),$r(65,90),$r(97,122)),$r(48,57))))
    $iif($isid,return,.msg $2 4(Password4):) %password
    echo -a 4(Password4) Send! ( %password )
  }
}