Internet Explorer (IE6, IE7) PNG transparency bug

I simply can't understand Microsoft, how they can ship Internet Explorer AGAIN with a silly PNG alpha-channel bug. I added a PNG-24 image to the homepage (get in touch button) and IE simply failed to display the border images' Alpha channel, if they are used as background-image from CSS. I thougt it was an IE6 problem only, but no: IE7 still does not know how to handle properly, so I switched back to the good old IE PNG Fix library from TwinHelix to do the work. Update: If you're using IE6 and IE7 on the same machine, IE7 will report itself as IE6 too - so make sure to add the [If IE] clause.