PNG Overlay
The nice thing about this method is that you are just applying an absolutely positioned <div> with a PNG backround over the top of a regular image, so you still get the benefits of a relevant alt attribute / value pair, as well as printing images because they are technically in the foreground as far as the browser is concerned. It will even work in IE6, with the proprietary Microsoft alpha style filter applied. IE7 will handle the transparency natively.
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