; put this in Remote Scripts:

alias rainbow {
  if ($group(#rainbow) == on) {
    var %cindex = 1
    var %len = $mid($1-,1,0)
    var %in
    var %let = 1
    var %letter
    while (%let <= %len) {
      %letter = $mid($1-,%let,1)
      if (%letter == $chr(32)) {
        if (($asc($mid($1-,$calc(%let + 1),1)) >= 48) && ($asc($mid($1-,$calc(%let + 1),1)) <= 57)) {
          %in = %in $+ $chr(32) $+  $+ $gettok(4.7.8.9.3.10.11.12.2.6.13,%cindex,46) $+  $+ $mid($1-,$calc(%let + 1),1)     
        }
        else {
          %in = %in $+ $chr(32) $+  $+ $gettok(4.7.8.9.3.10.11.12.2.6.13,%cindex,46) $+ $mid($1-,$calc(%let + 1),1)
        }         
        inc %cindex
        %let = $calc(%let + 2)
      }
      else if (($asc(%letter) >= 48) && ($asc(%letter) <= 57)) {
        %in = %in $+  $+ $gettok(4.7.8.9.3.10.11.12.2.6.13,%cindex,46) $+  $+ %letter
        inc %cindex
        %let = $calc(%let + 1)
      }
      else if ((%letter == $chr(2)) || (%letter == $chr(31)) || (%letter == $chr(15)) || (%letter == $chr(22))) {
        %in = %in $+ %letter
        %let = $calc(%let + 1)
      }
      else {
        %in = %in $+  $+ $gettok(4.7.8.9.3.10.11.12.2.6.13,%cindex,46) $+ %letter
        inc %cindex
        %let = $calc(%let + 1)
      }
      if (%cindex == 12) { %cindex = 1 }
    }
    return %in
  }
  else {
    return $1-
  }
}
#rainbow off
on *:INPUT:*:{
  if (/* !iswm $1) {
    //msg $active $rainbow($1-) | halt 
  }
}
#rainbow end

; put something like this in Popups (can be in status, channel, query, nick list, menu bar, whichever you want... select it by clicking on the Popups tab, and then clicking "View")
$iif(($group(#rainbow) == on),Disable Rainbow Script,Enable Rainbow Script):{
    if ($group(#rainbow) == on) { /.disable #rainbow }
    else { /.enable #rainbow }
  }