Exporting Alphas

So I'm doing various effects on several layers of animation in Premiere Pro CS3...I've got a bunch of characters with shadows and reflections at their feet but I want to then export the characters and composite them over a background so so that I can do some fancy multiplaining backgrounds...only problem is I can't seem to preserve my transparencies...it exports a black background behind it.  I can't just make a green screen and chroma key it either because my shadows and reflections are semi transparent.  There must be a way to export from premiere and preserve the transparency/alpha...is it a setting that I need to consider or is it just dependant on which file type I choose.
Any suggestions?
Thanks

Craig,
AFAIK - there is no way to export alpha in PPRO (except  flv Flash)
"You can't teach an old dog to bark", but let me try...
In CS3 (I don't have CS4) you can for example:
1. Export Movie (CS3 still can), select a format/codec with alpha support, for example QT animation or uncompressed Video for Windows, and make sure to select the "Million + colors"
2. Export AME, and there do the same as 1. but QT (except for FLV) seems to be the best alternative.
Anyway, Hunt sort of said it, so credit to him.
you would just need to choose Million + Colors
To Hunt:
I got the best one. But, you know, since you weren't there, you'll never know
Dag
EDIT: Slow typing (me), but just saw that mentalcase (hopefully less than me) found the solution on his own, I'm happy for that.

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