插入透明32位png格式图片支持ie5.5+、 FF、chrome、safari

// 页面引用js
function correctPNG() 
{ 
var arVersion = navigator.appVersion.split("MSIE") 
var version = parseFloat(arVersion[1]) 
if ((version >= 5.5) && (document.body.filters)) 
    { 
for(var j=0; j<document.images.length; j++) 
       { 
var img = document.images[j] 
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 
             j = j-1 
          } 
       } 
    }     
} 
if (document.all) {
// IE
  window.attachEvent("onload",correctPNG);
} else {
// Firefox 
    window.addEventListener(\'load\', correctPNG, false);
}