This is a Javascript library that sandwiches PNG image support into IE6 without much fuss.
You can use PNGs as the SRC of an <IMG/> element or as a
background-image property in
CSS.
If you attempt the latter, you will find that, unlike with vanilla usage of AlphaImageLoader, background-position and background-repeat work as intended.
As a bonus, "fixed" elements will respond to a commonly used set of Javascript style assignments, as well as the
A:hover pseudo-class.
http://www.dillerdesign.com/experiment/DD_belatedPNG/