This script make you say the welcome msg as a notice to every person that joins every channel on every server, I did it in a channel on a server that just got DDOS'ed and went from 300 users to 1500 users, so it said Welcome to #Channelname, nickname - fail.

::

on *:join:#:#CHANNEL-NAME {
if ($nick != $me) {
if ($me isop $chan) {
if ($nick isvoice $chan) { noop }
else {
mode $chan +v $nick
}
}
notice $nick Welcome to $chan , $nick Enjoy!:)
}
}