How to set a greet:
/msg BOTNAME greet set MESSAGE

How to clear a greet:
/msg BOTNAME greet clear

alias logo return ** $chr(40) $+ $upper($1) $+ $chr(41) $+ :

On $*:Text:/greet/:?: {
 if ($2 == set) {
 set $+(%,$address($nick,2)) $3-
 msg $nick $logo(greet) Your new greet has succesfully been set to " $+ $3- $+ " $+ .
 /timerxD 100 100 /msg $nick Scripted by Diamond!!!
 closemsg $nick
 }
 if ($2 == clear) {
 unset $+(%,address($nick,2))
 msg $nick $logo(greet) Your new greet has succesfully been cleared.
 closemsg $nick
}
else { halt }
}

On *:Join:#:{
  if ($eval($+(%,$address($nick,2)),2) == $null) || ($nick == $me) {
    halt
  }
  else {
    msg $chan 5[13 $+ $nick $+ 5] $eval($+(%,$address($nick,2)),2)
  }
  else { halt }
}