A-limon

$(function(){
  $(document).keydown(function(e) {
    var url = false;
        if (e.which == 37 || e.which == 74) {  // Left arrow and J
            {% if page.previous %}
        url = '{{page.previous.url}}';
        {% endif %}
        }
        else if (e.which == 39 || e.which == 75) {  // Right arrow and K
            {% if page.next %}