(function() {
  $.fn.disableDoubleSubmit = function(timeout) {
    if(!timeout || timeout < 1) {
      timeout = 10000; // 10sec.
    }
    $(this).bind("submit",function() {
      var submit_buttons = $(":submit, :image",this);
      submit_buttons.attr("disabled", true);
      setTimeout(function(){
        submit_buttons.attr("disabled", false);
      },timeout);
    });
    return this;
  }
})(jQuery);