Archive all messages from "select" drop down

[whycantihaveaname]

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Title: Archive all messages from "select" drop down
Version: 0.94.1

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I was wondering if someone has done this already, or knows how to?

On the "admin_main.php" page there is a drop down menu that has "Delete Selected Tickets" and "Mark Selected Tickets Resolved" in it. I want to add another item to it that says "Archive All Selected Tickets". At the moment I have to go to each individual message and choose "Add to Archive", but I want to be able to archive a month's worth of messages at a time.

Does anyone know how to do this?

Many Thanks in Advance,
David