(function($) {
$.fn.typewriter = function() {
        this.each(function() {
            var $ele = $(this), str = $ele.text(), progress = 0;
            $ele.text('');
            var timer = setInterval(function() {
                $ele.text(str.substring(0, progress++) + (progress & 1 ? '_' : ''));
                if (progress >= str.length+1) clearInterval(timer);
            }, 35);
        });
        return this;
    };
})(jQuery);