Code:
alias readhelp {
  /inc %help.line
  if (%help.line > $lines(help.txt)) /set %help.line 1
  /msg $iif($1, $1, [color:Blue]#channel[/color]) $read(help.txt,%help.line)
  .timer 1 300 /readhelp $1
}


Use /readhelp <channel>, where <channel> is the channel you'd like it to advertise to. The channel in blue is a default channel when none has been specified.


-KingTomato