function transparentPNGs() {

    if (
        ((navigator.userAgent.toLowerCase()).indexOf('msie') + 1) &&  
        ((navigator.userAgent.toLowerCase()).indexOf('windows') + 1)  &&
        !((navigator.userAgent.toLowerCase()).indexOf('opera') + 1)     
        ) {

        for (i=0;i<document.images.length;i++) {
            if (document.images[i].src.toLowerCase().indexOf('.png') + 1) {
                var pngImage = document.images[i];
                pngImage.style.width = pngImage.offsetWidth;
                pngImage.style.height = pngImage.offsetHeight;
                pngImage.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+pngImage.src+"',sizingMethod='scale');";
                pngImage.src = '/images/transparent.gif';
            }
        }
    }

}

transparentPNGs();