解决ie6下png透明的问题

/*解决ie6下png透明的问题*/
function correctPNG() 
{
    for(var i=0; i<document.images.length; i++)
    {
      var img = document.images[i]
      var imgName = img.src.toUpperCase() ;
      var temp = imgName.split('?');
      imgName = temp[0];
      if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
      {
           var imgID = (img.id) ? "id='" + img.id + "' " : ""
           var imgClass = (img.className) ? "class='" + img.className + "' " : ""
           var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
           var imgStyle = "display:inline-block;" + img.style.cssText 
           if (img.align == "left") imgStyle = "float:left;" + imgStyle
           if (img.align == "right") imgStyle = "float:right;" + imgStyle
           if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle  
           var strNewHTML = "<span " + imgID + imgClass + imgTitle
                          + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
                          + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
                          + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
           img.outerHTML = strNewHTML ;
           i = i-1;
      }
    }
}