[thelist] PNG and alpha channel ?

Hello,
I've never used PNG on my websites, to do transparent background I was using
GIF but limited to 256 colours.

and this morning I said to myself, why not trying this PNG format for doing
transparent background on a 24bits image ?
I tried and on the webpage, the transparent bit has a grey colour.
IE6 WIN98

So I reverted to my GIF..

But wanted to know if that's normal/intended behaviour of PNG displayed in
browsers?

Cordialement,

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