Using 2 different 'showthread' templates based on the thread life

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Hello,

I would like to show 2 different showthread templates, with the following schedule:

- Template A would show 1 time (as soon as the thread is initially created) and then not show for the next 2 hours (starting from the initial creation of the thread)

- Template B would show only within the first 2 hours of the life of the thread.

I would like to do this because the showthread template contains google adsense ads that are not profitable until crawled by google (which often takes x number of hours)

Any help on how to get this done will be greatly appreciated.

Thanks.

Roy