on *:TEXT:!av on:#:{
set %avon [ $+ [ $chan ] ] on
msg $chan Av is now on
}
on *:TEXT:!av off:#:{
unset %avon [ $+ [ $chan ] ] 
msg $chan Av is now off
}
on *:JOIN:#:{
if (%avon [ $+ [ $chan ] ] == on) {
mode $chan +v $nick
}