Yes I would have to agree with Soresser on that. You Could Try This.

menu * {
  .Greet
  ..Set Greet Chan: { set %greetchan $?=\"Enter Channel. i.e. #scripts\" | echo -a Greet Channel Is Now Set As %greetchan  }
  ..Turn Greet On: { set %greet on | echo -a Greet Is Now On In Channel %greetchan  }
  ..Turn Greet Off: { unset %greet | echo -a Greet Is Now Off  }
}
on *:load: { 
  echo 4 -a  NouMeRo Join-Part Notice Has been loaded.
  echo 4 -a Author: NouMeRo
  echo 4 -a In case of bugs please e-mail me at
  echo 4 -a  vaggelakhs@hotmail.com
  echo 4 -a NouMeRo Site @http://www.noumero.tk
  echo 4 -a Download NouMeRo English Script Edition @  
  echo 4 -a           www.noumero.tk
}
on !*:JOIN:%greetchan: {
  if (%greet == on) { .notice $nick 7 $nick Welcome to %greetchan 11 Have a nice 7 Chat }
}
on !*:PART:%greetchan: {
  if (%greet == on) { .notice $nick 7 $nick You left from %greetchan 11 cu 7 later }
}