What the expire does is prevent the words being pulled. This is really only efficient with the DB - but should also work for the non DB option - however the cron job will have to run to pull them out of the cache so to speak.
And yes - you have to manually add the cron job.
Also - just noticed a small typo in the read me for the GALBox that is preventing it from staying open so a user can roll over it. Ill update the package tonight with the change (and a revised cron job as there is a typo in it too).
For those having problems with the popups staying open (this was mentioned a couple days ago)... Replace your GALBox div in your header template with this one:
CHANGE TO:
Code:
<div id="GALBox" style="position: absolute; z-index: 100; visibility: hidden;" onmouseover="this.style.visibility='visible';"
onmouseout="this.style.visibility='hidden';">
</div>