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marquee is a deprecated HTML element, so its use is frowned upon. It’s both a styling element and behavioural and has no place in modern HTML mark-up.
You could use an animated gif? Or a flash animation which, given that it’s purely a design feature I don’t see any problems with accessibility with using flash in this case.
I’d be inclined to use flash in this case – and I don’t say that often :p lol