<!--[if gte IE 5.5000]>
// Correctly handle PNG transparency in Win IE 5.5 or higher.
// http://homepage.ntlworld.com/bobosola. Updated 02-March-2004
//Modified By Sheneyan 06.6.22
//修改内容：改成每个图片onload的时候进行判断是否png，并设置透明
function correctPNG(img) 
   {
    var imgName = img.src
  if (imgName.match(/\.png$/i)){
    var span=null;
    if (img.tid){
     span=document.getElementById(img.tid);
    }
    else{
       span=document.createElement("");
      span.id="_"+Math.random()*100;
      img.tid=span.id;
      img.parentElement.insertBefore(span,img);
    }
    span.className=img.className?img.className:"";
    span.title=img.alt?img.alt:"";
     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   
   span.style.cssText="width:"+img.width+"px;height:"+img.height+"px;"+imgStyle+";"+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"     + "(src=\'" + img.src + "\', sizingMethod='scale');"
   img.style.display="none";
  }
  else{
    if (img.tid){
      document.getElementById(img.tid).style.display="none";
    }
    img.style.display="";
  }
   }
function imgInit(){
  for (var i=0,img;img=document.images[i];i++){
  img.attachEvent("onload",function(){correctPNG(event.srcElement)});
  correctPNG(img);
  }
}
window.attachEvent("onload", imgInit);
<![endif]-->