var imageDirectory = '/images/ads';
var ads_a = [['a1.jpg', '#link1'],
             ['a2.jpg', '#link2'],
             ['a3.jpg', '#link3']];
var ads_b = [['b1.jpg', '#link4'],
             ['b2.jpg', '#link5'],
             ['b3.jpg', '#link6']];
var ads_c = [['c1.jpg', '#link7'],
             ['c2.jpg', '#link8'],
             ['c3.jpg', '#link9']];
var ads_a_startDelay = 7;
var ads_a_fadeDuration = 2;
var ads_a_holdDuration = 9;
var ads_b_startDelay = 3;
var ads_b_fadeDuration = 2;
var ads_b_holdDuration = 7;
var ads_c_startDelay = 5;
var ads_c_fadeDuration = 2;
var ads_c_holdDuration = 7;