ie6下png透明两种好用的解决方案

方法一:
<script language="java script">
// 修复 IE 下 PNG 图片不能透明显示的问题
function fixPNG(myImage) {
var arVersion = navigator.appVersion.split("MSIE");
var version = parseFloat(arVersion[1]);
if ((version >= 5.5) && (version < 7) && (document.body.filters))
{
    var imgID = (myImage.id) ? "id='" + myImage.id + "' " : "";
    var imgClass = (myImage.className) ? "class='" + myImage.className + "' " : "";
    var imgTitle = (myImage.title) ? "title='" + myImage.title  + "' " : "title='" + myImage.alt + "' ";
    var imgStyle = "display:inline-block;" + myImage.style.cssText;
    var strNewHTML = "<span " + imgID + imgClass + imgTitle

   + " style=\"" + "width:" + myImage.width

   + "px; height:" + myImage.height

   + "px;" + imgStyle + ";"

   + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"

   + "(src=\'" + myImage.src + "\', sizingMethod='scale');\"></span>";
    myImage.outerHTML = strNewHTML;
} }

window.onload=function(){
        document.getElementById("top").style.height=screen.height/5+"px";
       
}//
</script>

<img src="logo.png" width="328" height="325" border="0" onload="fixPNG(this)" />

方法二:
<script language="java script">
function correctPNG() 
{
for(var i=0; i<document.images.length; i++)
{
  var img = document.images[i]
  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;" + 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
  }
}
}
window.attachEvent("onload", correctPNG);
</script>