Mine

using terms from application "Colloquy"
	on process user command theCommand with theArguments for theView
		if theCommand is "gone" or "away" then
			tell theView to send message "<strong>is away: </strong>" & theArguments to theView with action tense
			do shell script "defaults write com.Colloquy.awayscript 'awaym' '" & theArguments & "'"
			do shell script "defaults write com.Colloquy.awayscript 'awayt' '" & (current date) & "'"
		end if
		
		if theCommand is "back" then
			try
				if (do shell script "defaults read com.Colloquy.awayscript 'awaym'") is "" then
					add event message "You were not away"
				end if
				
				if (do shell script "defaults read com.Colloquy.awayscript 'awaym'") is not "" then
					set timestampr to (current date) - (date (do shell script "defaults read com.Colloquy.awayscript 'awayt'"))
					set ghours to (timestampr div hours)
					set gminutes to (timestampr - ((ghours * 60) * 60)) div minutes
					set gseconds to (timestampr - (timestampr div minutes * 60))
					set gonetime to "Gone " & ghours & " hours, " & gminutes & " minutes, " & gseconds & " seconds."
					set gonetime to "Gone " & timestampr div hours & " hours, " & timestampr div minutes & " minutes, " & timestampr - (timestampr div minutes * 60) & " seconds."
					tell theView to send message "<strong>is back: </strong>" & gonetime with action tense
					do shell script "defaults write com.Colloquy.awayscript 'awaym' ''"
					do shell script "defaults write com.Colloquy.awayscript 'awayt' ''"
				end if
			on error (err)
				tell theView to add event message err
			end try
		end if
	end process user command
end using terms from