This script provides a fairly decent away system for you. It will mark you away on ALL networks, add a tag to your name (if so desired), let everyone know you're away (if you really want), and will remember that you are away should you get disconnected. It will also log highlights received while you are away.
To mark yourself away, type:
/a [reason]
And when you're back, type:
/re
I hope you enjoy this script. Please feel free to send suggestions.