have adium running while I'm at work

adiumscript.rb

require 'rubygems'
require 'appscript' # using 0.6.1

adium = Appscript.app "adium"
return unless adium.is_running?

accnts = adium.accounts.get
work_accnt = accnts.find { |acc| acc.name.get == "[email protected]" }

now = Time.new

day = now.wday
weekend = day == 0 or day == 6

hour = now.hour
lunnys_time = hour < 9 || hour > 17

if weekend or lunnys_time
  adium.go_offline work_accnt
else
  adium.go_online work_accnt
end

com.alunny.adiumscript.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC -//Apple Computer//DTD PLIST 1.0//EN http://www.apple.com/DTDs/PropertyList-1.0.dtd >
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>com.alunny.adiumscript</string>
    <key>ProgramArguments</key>
    <array>
      <string>/usr/bin/ruby</string>
      <string>/Users/alunny/bin/adiumscript.rb</string>
    </array>
    <key>StartInterval</key>
    <integer>900</integer>
  </dict>
</plist>