Png Files with transparency

I'm wanting to use iPhoto to organize my scrapbooking graphics. Problem is that the majority are png with transparency. When I imported them, all of the transparent portions of the images appeared in black, so many of them just look like black squares, because it's a black image on transparent background.
Is there any way to get the png to look normal or is this a flaw in iPhoto. Does iPhoto 6 fix this problem?
Thanks.
Rayne

After doing a little more investigating, I realized that iPhoto is generating the thumbnails in jpg, therefore creating a non-transparent thumbnail. When the image is viewed full size, it appears fine. So it's just the thumbnail that is causing the problem.
Is there a way to get it to generate thumbnails so that the transparent portions get filled with white instead of black? I use a white background in iPhoto so this would make them appear transparent. Or at least I'd be able to see the transparent portions better regardless of which background I use.
Thanks.

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