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CSS: how to turn a color image into a gray or black and white image

Possible duplicate:
Convert image to grayscale in HTML / CSS

How to change a color image to a gray or black and white image, such as a website with CSS?

Can this be done only in CSS or do I need JavaScript (jQuery)?

Thank.

Edit:

Thanks for the answers to the guys. I notice that the trick is to make two different color images: one is full and the other is b / w. I was hoping this could be done in one image. So there is no way to do this from a "trick" ??

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