var blank = new Image();
blank.src = '/images/pixel.gif';

$(window).load(function () {
    var badBrowser = (/MSIE ((5\.5)|6)/.test(navigator.userAgent) && navigator.platform == "Win32");
    if (badBrowser) {
        // get all pngs on page
        $('img[src$=.png]').each(function () {
            if (!this.complete) {
                this.onload = function () { fixPng(this) };
            } else {
                fixPng(this);
            }
        });
    }
});

function fixPng(png) {
    // get src
    var src = png.src;
    // set width and height
    if (!png.style.width) { png.style.width = $(png).width(); }
    if (!png.style.height) { png.style.height = $(png).height(); }
    // replace by blank image
    png.onload = function () { };
    png.src = blank.src;
    // set filter (display original image)
    png.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "',sizingMethod='image')";
}