(function($) {
    $.fn.sc = function() {

        var el = this;
        var position = this.position();
        var scrollH;

        $(window).scroll(function () {
            scrollH = $(window).scrollTop();
            if (scrollH > position.top) {
                $(el).css("position", "absolute");
                $(el).css("top", scrollH);
            }
        });
    }

})(jQuery);