PNG8 and 32 in older browsers

Im making a site that has a semi transparent image as a background image for a div with text.
Im looking at using a PNG8 or 32, but how and will these degradee in older browsers? If they become opaque thats fine, but if they dissapear then the text will be hard to read.
Thanks

In IE6 any transparent png will appear with a grey box. You can use this png fix to solve that problem
http://www.twinhelix.com/css/iepngfix/

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