ie6下实现png透明
update：最近发现一个更好的解决方案，使用VML替换AlphaImageLoader，可以解决被替换元素hover状态不起作用的问题。详见：http://www.dillerdesign.com/experiment/DD_belatedPNG/。我使用VML方式做的页面：http://fang.kuwo.cn/p/Radio// Universal transparent-PNG enabler for MSIE/Win 5.5+// http://dsandler.org// From original code: http://www.youngpup.net/?request=/snippets/sleight.xml// and background-image code: http://www.allinthehead.com/retro/69// also://* use sizingMethod=crop to avoid scaling PNGs (who would do such a thing?)//* only do this once, to make it compatible with CSS rolloversif (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.attachEvent) {window.attachEvent("onload", enableAlphaImages);}function enableAlphaImages(){var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');var itsAllGood = (rslt != null && Number(rslt) >= 5.5);if (itsAllGood) {for (var i=0; i<document.all.length; i++){var obj = document.all;var bg = obj.currentStyle.backgroundImage;var img = document.images;if (bg && bg.match(/\.png/i) != null) {var img = bg.substring(5,bg.length-2);var offset = obj.style["background-position"];obj.style.filter ="progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+img+"', sizingMethod='crop')";obj.style.backgroundImage = "url('/images/spacer.gif')";obj.style["background-position"] = offset; // reapply} else if (img && img.src.match(/\.png$/i) != null) {var src = img.src;img.style.width = img.width + "px";img.style.height = img.height + "px";img.style.filter ="progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+src+"', sizingMethod='crop')"img.src = "/images/spacer.gif";}}}}注意，需要将png图片设置为元素的背景图片，并且添加一个图片“spacer.gif”。
示例见：http://blog.gulu77.com/demo/200809/test_PNGTransparncyinIE/
转自：http://blog.gulu77.com/?p=147
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