As you can see that will get quite messy having hundeds of nicknames.

Code:
alias msgs {
  if ($$1 == Andy1) { do something }
  elseif ($$1 == Andy2) { do something }
  elseif ($$1 == Andy3) { do something }
  elseif ($$1 == Andy4) { do something }
  elseif ($$1 == Andy5) { do something }
  elseif ($$1 == Andy6) { do something }
  elseif ($$1 == Andy7) { do something }
  elseif ($$1 == Andy8) { do something }
  elseif ($$1 == Andy9) { do something }
  else  { bleh.. }
}
[code]
Try this maybe?

[code]
menu nicklist {
  MSG $$1: msgs $$1
}

alias msgs {
  msg $$1 $input(Send Message:,e,Send message to $$1)
}