$(document).ready(function() {
  $(".image img[rel]").overlay({
    onBeforeLoad: function() {
      var rel = $("img", this.getOverlay()).attr("rel");
      $("img", this.getOverlay()).attr("src", rel);
      $("html").css("overflow-x", "hidden");
    },
    onClose: function() {
      $("html").css("overflow-x", "visible");
    }
  });
});