(Just for support purposes) I got the font working correctly. Here's my final code:

Code:
ON ^*:NOTICE:*:*: {  
  $iif(!$window($+(@Notices-,$network)),window -g1ael $+(@Notices-,$network) Arial 12)
  aline $+(@Notices-,$network) $chr(3) $+ 04 $+ ( $+ $nick $+ ): $1- 
  beep
  halt 
}