Key out a white background?

I have a clip of a woman dancing against a white background - she's wearing multiple colors. I would like to use her silhouette (solid black image) against another background, so keying out the white. I have tried several of the key filters and the best I have come up with so far is the dancer, still in color, with the white keyed out. Or the dancer keyed out, leaving a white foreground with her "hole" in it.
Is it possible just to get a black silhouette against whatever background image I want, with what I have got?
Thanks.

See if this helps you:
http://vimeo.com/37917882
MtD

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http://tv.adobe.com/watch/the-russell-brown-show/masking-basics-in-photoshop-cs5/
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Thanks much for this helpful comment. It did indeed let me change the TextEdit background - and I suspect the same approach will work with some other apps as well.
Unfortunately, Maple isn't one of them. I went thru all the Maple menu tabs and options, and while there are many for modifying the text - its color, size, etc. - there are none whatever for affecting the background. So it seems as tho it is Maple that is simply lacking a capability that can be built in (how easily, I don't know).
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I want to suggest to Maplesoft to add the background choice capability, but that would probably be better received if I can suggest to them how to accomplish it. Since I'm not a developer and know nothing about OS X's internals, I'm unable to do that. If anyone has any ideas on this score, or can point me to relevant information, I would much appreciate it.
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You need to ask in the Flash Professional forum. You CANNOT edit any Flash content with the Player.

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Key out a white background?

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