IE PNG Alpha Transparency Hack
An IE PNG Alpha Transparency Hack / Fix / Workaround for Windows IE 5.5+.
http://homepage.ntlworld.com/bobosola/pnghowto.htm
I vow never to use .GIF transparency again. Nor will I be satisfied with index mode transparency. It's not worth the effort (and maintenance!)
This is yet another of those stupid things we do on the web because we must.
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Edit:
A more comprehensive CSS hack for Internet Explorer is IE7:
http://dean.edwards.name/IE7/
It works around portable network graphic (png) transparencies, min-height css problems and other IE standards issues.
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