*Thanks Walter* - by going through the issues top-down, as you suggested, I eventually uncovered the problem. It wasn't in the page-code itself, but a result of an update to the site template - and there's a conflict between two types of effects - which I will now have to solve. You also enlightened me to Firefoxes debugging, etc. I wasn't using it, but will do now! *Thanks Jason* - you've highlighted my misunderstanding of how to link to scriptaculous libraries. I'll re-read the instructions ;-! .
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