jQuery(document).ready(function() {
var TopImages = ['images/mountain/top/01.jpg', 'images/mountain/top/02.jpg', 'images/mountain/top/03.jpg',
                          'images/mountain/top/04.jpg', 'images/mountain/top/05.jpg', 'images/mountain/top/06.jpg'];
    var TopRndNum = Math.floor(Math.random() * TopImages.length);

    var SmallImages = ['images/mountain/small/01.jpg', 'images/mountain/small/02.jpg', 'images/mountain/small/03.jpg',
                           'images/mountain/small/04.jpg', 'images/mountain/small/05.jpg', 'images/mountain/small/06.jpg',
                           'images/mountain/small/07.jpg', 'images/mountain/small/08.jpg', 'images/mountain/small/09.jpg',
                           'images/mountain/small/10.jpg', 'images/mountain/small/11.jpg', 'images/mountain/small/12.jpg',
                           'images/mountain/small/13.jpg'];
    var SmallRndNum = Math.floor(Math.random() * SmallImages.length);
    var SmallRndNum2 = Math.floor(Math.random() * SmallImages.length);

    var LargeImages = ['images/mountain/large/01.jpg', 'images/mountain/large/02.jpg', 'images/mountain/large/03.jpg',
                           'images/mountain/large/04.jpg', 'images/mountain/large/05.jpg', 'images/mountain/large/06.jpg',
                           'images/mountain/large/07.jpg', 'images/mountain/large/08.jpg', 'images/mountain/large/09.jpg',
                           'images/mountain/large/10.jpg', 'images/mountain/large/11.jpg', 'images/mountain/large/12.jpg'];
    var LargeRndNum = Math.floor(Math.random() * LargeImages.length);

    while (SmallRndNum == SmallRndNum2)
    { SmallRndNum2 = Math.floor(Math.random() * SmallImages.length); }

    jQuery(".ti1").attr({ src: TopImages[TopRndNum] });
    jQuery(".si1").attr({ src: SmallImages[SmallRndNum] });
    jQuery(".si2").attr({ src: SmallImages[SmallRndNum2] });
    jQuery(".li1").attr({ src: LargeImages[LargeRndNum] });
});