Indexing wrong color in FW 3. >:(

Hi, well I don't ask questions often here but this is just buggin the heck out
of me.

I have a bitmap image that I want to convert to PNG to import into Flash 4.

I want to do this because I need the background, a pure black, to be 
transparent.

I've tried  breaking it apart and removing the background but this leaves 
the Flash
file too big for just one image and it loads too slowly.

The problem is that when I choose Export Preview with the settings of PNG 8 
bit, 256
colors, indexed transparency with the color, in this case black, and export 
with these
settings. I then import it into Flash but the stupid image comes in with 
the transparency
being indexed as pure white and not black.

Any idea why ????? I've even tried locking the white color that is being 
set to transparent
to no avail.

Thanks for any help with this.

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