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Is IE6 the only browser that doesn't support PNG transparency?
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PNG is widely supported, with all major browsers offering full support for its features.
An important benefit, and oftentimes deciding factor for using a PNG file, is that–unlike a JPG–they support transparency. This allows you to have a transparent background around an irregular-shaped object and avoid a white (or other colored) box outlining your image.
An alpha channel, representing transparency information on a per-pixel basis, can be included in grayscale and truecolor PNG images. An alpha value of zero represents full transparency, and a value of (2^bitdepth)-1 represents a fully opaque pixel.
Transparency. The GIF and PNG formats also both support transparency. If you need any level of transparency in your image, you must use either a GIF or a PNG. GIF images (and also PNG) support 1-color transparency.
From: http://www.alistapart.com/articles/pngopacity/
It turns out that most of the latest versions of the major browsers fully support alpha transparency with PNG – namely, Netscape 6, Opera 6, and recently-released Mozilla 1, all on Windows; and, for the Mac, Internet Explorer 5, Netscape 6, Opera 5, Mozilla 1, OmniWeb 3.1, and ICab 1.9. Incredibly, PNG even works on Opera 6 for Linux, on WebTV, and on Sega Dreamcast.
IE5.5+/Win, bless its heart, will, in fact, display a PNG, but it doesn’t natively support alpha transparency. In IE5.5+/Win, the transparent area of your PNG will display at 100% opacity – that is, it won’t be transparent at all.
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IE 5.5 and IE 6 don't correctly display a PNG image, they don't support alpha transparency. This can be fixed with this hack. I use it on all my sites and works perfectly.
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Pretty sure that IE5 doesn't either.
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