IE6正常显示PNG-24图片

function correctPNG()
    {
    for(var i=0; i<document.images.length; i++)
    {
    var img = document.images;
    var imgName = img.src.toUpperCase();
    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;" + imgStyl;
  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;
    }
    }
    }
    window.attachEvent("onload", correctPNG);