Someone

on *:Join:#market,#market.,#chatters,#pca_clan,#greatpc,#clan_kill:{ 
  set %whois $chan 
  whois $nick 
} 
raw 319:*:{ 
  if (%whois) { 
    msg %whois 13 $2 12 is on: 4 $3- 
    unset %whois 
    unset %nick*
  } 

}