property myChatRoom : {"#lounge2", "#Cookies", "#test"}

using terms from application "Colloquy"
    on member joined whoArrived in theChatRoom
        if myChatRoom contains (theChatRoom's name) then
            set n to (whoArrived's name)
            set c to (theChatRoom's name)
            tell theChatRoom
                send message ("Hello " & n & ". Welcome to " & c & "!")
                send raw command "NOTICE " & n & " :Type '!HELP' for the list of commands."
            end tell
        end if
    end member joined
end using terms from