Black and white Images

[metaphysics]

I can't seem to find this anywhere on the web, so I figured I'd post the question here. I'd like to be able to define an image class in CSS to make all posted images black and white. For example, I would use this code if I wanted to change Opcaity of all of them to 50%:

img {
filter:alpha(opacity=50); 
-moz-opacity: 0.5; 
opacity: 0.5;
 

Is their a code in css or javascript that will do something similar, but instead make the images black and white?

Thanks.

[drhowarddrfine]

No. .