Or alternativly have this instead;

on @:text:!Invite:#: {
set %inviteuser $2-
invite $2- $chan
}
on :JOIN:#: {
if ($nick == %inviteuser)
.Notice $Nick Hello $nick you have been invited to $chan you must be pretty special!
}

With that you could add an optional welcome message to the script for those who weren\'t invited, for example;

/join #chan

Mushufasa has joined #chain!