function findImages() {
  $$('#content img.replace').each(function(e){ 
    /*if(Prototype.Browser.IE) {
      polaroid = "<span class=\"polaroid-bg\" style=\"background-image: url('"+e.src+"');\"><img src=\"../img/polaroid-overlay.gif\" alt=\"\" /></span>";
    } else {*/
      polaroid = "<span class=\"polaroid-bg\" style=\"background-image: url('"+e.src+"');\"><img src=\"../img/polaroid-overlay.png\" alt=\"\" /></span>";
    /*}*/
    Element.replace(e, polaroid);
  });
}

Event.observe(window, "load", findImages);