Vertical Align of element jQuery

gistfile1.txt

(function ($) {
        // VERTICALLY ALIGN FUNCTION
        $.fn.vAlign = function() {
            return this.each(function(i){
            var ah = $(this).height();
            var ph = $(this).parent().height();
            var mh = Math.ceil((ph-ah) / 2);
            $(this).css('margin-top', mh);
            });
        };
    })(jQuery);