png图片ie6下不透明的解决方法

在ie7+和ff下默认支持png的透明，ie6里面是没有透明效果的。查了几种方案，备忘
1、采用方案

<input name="image" type="image" 
style="filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='images/test.png',sizingMethod='crop'); "/>
既：
<style type="text/css">
<!--
.pngpic { filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(src='/pngpic.png',sizingMethod='crop'); }
-->
</style>

 2、备选

function fixPng() { 
  var arVersion = navigator.appVersion.split("MSIE") 
  var version = parseFloat(arVersion[1]) 
 
  if ((version >= 5.5 && version < 7.0) && (document.body.filters)) { 
    for(var i=0; i<document.images.length;></document.images.length;>      var img = document.images[i]; 
      var imgName = img.src.toUpperCase(); 
      if (imgName.indexOf(".PNG") &gt; 0) { 
        var width = img.width; 
        var height = img.height; 
        var sizingMethod = (img.className.toLowerCase().indexOf("scale") &gt;= 0)? "scale" : "image"; 
        img.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + img.src.replace('%23', '%2523').replace("'", "%27") + "', sizingMethod='" + sizingMethod + "')"; 
        img.src="images/blank.gif" mce_src="images/blank.gif"; 
        img.width = width; 
        img.height = height; 
        } 
      } 
    } 
  }