IE PNG Alpha Fix v1.0 RC4
IE/Windows has very poor PNG support with regards to transparency
As you are no doubt aware, .
That's where this script fits in. It's an IE5.5+ 'behaviour' that you can upload, place
one line in your CSS file, and forget. The HTC file will then automatically add near-native PNG
support to IMG elements and (unlike many other PNG fix scripts) also supports any element with a
"background-image:" CSS property, with no alterations to the page HTML!
Background PNG images can't be tiled. This is a limitation of the IE filter.
It's most reliable on elements with non-'auto' dimensions set. So, give images and
other elements width/height values; '100%', '10em' and '200px' and so on are all OK.
Similarly, padding and borders don't indent the PNG image. An easy fix for
this is wrapping your PNG images in container DIVs or similar.
There may be about a short time as soon as the image loads when images are not
transparent, before the IE filter kicks in.
clipped from: www.twinhelix.com