var randomImages = [
    ['africa-1.jpg', 'http://www.privateislandsonline.com/cousineisland.htm'],
    ['africa-2.jpg', 'http://www.privateislandsonline.com/northisland.htm'],
    ['africa-3.jpg', 'http://www.privateislandsonline.com/round-island-seychelles.htm'],
    ['africa-4.jpg', 'http://www.privateislandsonline.com/alphonse-island.htm']
];
var randomImageDir = 'africa';