PNG with alpha channel + opacity in IE7

It was necessary to add to the site smoothly appearing images in PNG format with alpha channel. IE5.5-IE6 overcame a bug fix using AlphaImageLoader. I expected that there would be no problems with IE7. I was wrong ...

In IE7, when overlaying transparency on a semi-transparent PNG, the 8-bit alpha channel starts to behave like a 1-bit one. Fully transparent pixels are transparent and remain, while those that were even slightly opaque are superimposed on a black background.
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In addition, in IE7, the CSS3 opacity property was never introduced.

Test attached

UPD: At the above mentioned site, to achieve the desired effect, I had to use an old trick applied to translucent PNGs in IE <7. So much for alpha channel support.