Reducing image sizes - not anti-aliasing

Hi guys,
I've had a search around and haven't found much on this specifically (it's also a difficult thing to search for) so I hope someone here could maybe shed some light.
I'm fairly new to using Flash but well versed in other adobe software.
I have this problem:
I'm tweening a symbol so that it reduces in size. It was a png image. It goes from being big to small. When it's small it becomes less anti-aliased (clear jagged edge, more visible and directly proportional to how much it has been reduced)
This is something unrelated to actual tweening - it's just become obvious in this situation. It also happens when simply resizing using transform tools.
Here are some screen shots:
Thoughts?
Sam

Hi Ned,
Cheers for the answer but it's actually made no difference. It acts the same.
In any case, this time I don't have the time to faff about so I'll just live trace it and use a vector.
Thanks anyway, I'll mark this as answered; someone else might find it helpful.

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Reducing image sizes - not anti-aliasing

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