document.onkeydown = function(e) {
    e = e || window.event;

    if (e.target.className != 'comment-input' && e.target.className != 'comment-input reply-input') {
        var keycode = e.keyCode || e.which;
        if (keycode == 39) {
            document.querySelector('[title="Next Comic"]').click();
            return false;
        } else if (keycode == 37) {
            document.querySelector('[title="Previous Comic"]').click();
            return false;
        }
    }
};