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

$(document).ready(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='scale')";
}