(function($){
    var footer;

    $.fn.extend({
      stickyFooter: function(options) {
        footer = this;
        
        positionFooter();

        $(window)
          .scroll(positionFooter)
          .resize(positionFooter);

        function positionFooter() {
          var docHeight = $(document.body).height() - $("#sticky-footer-push").height();
          if(docHeight < $(window).height()){
            var diff = $(window).height() - docHeight;
            if (!$("#sticky-footer-push").length > 0) {
              $("#container").after('<div id="sticky-footer-push"></div>');
            }
            $("#sticky-footer-push").height(diff);
          }
        }
      }
    });
})(jQuery);