if (navigator.platform == "win32" && navigator.appname == "microsoft internet explorer" && window.attachevent) {
window.attachevent("onload", enablealphaimages);
}

function enablealphaimages(){
var rslt = navigator.appversion.match(/msie (\d+\.\d+)/, '');
var itsallgood = (rslt != null && number(rslt[1]) >= 5.5);
if (itsallgood) {
for (var i=0; i<document.all.length; i++){
var obj = document.all[i];
var bg = obj.currentstyle.backgroundimage;
var img = document.images[i];
if (bg && bg.match(/\.png/i) != null) {
var img = bg.substring(5,bg.length-2);
var offset = obj.style["background-position"];
obj.style.filter =
"progid:dximagetransform.microsoft.alphaimageloader(src='"+img+"', sizingmethod='crop')";
obj.style.backgroundimage = "url('/skin/mall/js/pixel.gif')";//替换透明png的图片
obj.style["background-position"] = offset; // reapply
} else if (img && img.src.match(/\.png$/i) != null) {
var src = img.src;
img.style.width = img.width + "px";
img.style.height = img.height + "px";
img.style.filter =
"progid:dximagetransform.microsoft.alphaimageloader(src='"+src+"', sizingmethod='crop')"
img.src = "/skin/mall/js/pixel.gif";//替换透明png的图片
}
}
}
}