Someone did write a MOD for something similar to this. I have not installed it yet.
The MOD is called:
Title Image Rotator Beta 0.8
The readme starts out like this:
Initial Release: 28 November, 2002
Image Rotator for strTitleImage
For Snitz 3.4.02+
Implementation: EASY
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Beta Release! Do not mess with this unless you are quite aware of what you are doing.
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OVERVIEW:
This image rotator shows any image you define from a date until a date.
It defines the variable strTitleImage new if the logic is TRUE
Send me an email if this is what you are looking for.
Cheers,
Etymon
I hope this helps.