The bottom line is, if you want alpha transparency in a PNG, and you want it to work in IE6, then you need to have the AlphaImageLoader filter applied.
Now, there are numerous ways to do it: Browser specific hacks, Conditional Comments, Javascript/JQuery/JLibraryOfChoice element iteration, Server-Side CSS-serving via UserAgent-sniffing...
But all of 'em come down to having the filter applied and the background removed.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…