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

$(document).ready(function(){

$(".roll").hover(function() {curr = $(this).find("img").attr("src");over = curr.replace(/_0\./, '_1.');$(this).find("img").attr({ src: over});},function() {$(this).find("img").attr({ src: curr});});$(".roll").find("img").each(function(i) {temp = this.src;pre = temp.replace(/_0\./, '_1.');preload_image_object = new Image();preload_image_object.src = pre;});

   var badBrowser = (/MSIE ((5\.5)|6)/.test(navigator.userAgent) && navigator.platform == "Win32");
   if (badBrowser) {
     // get all pngs on page
     $('img.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')";
 }