Javascript Rotating Ad Banner

rotating-ad-banner.js

var currentBannerIndex = 0;
        var banners = [
					{ image: 'banner-1.jpg', url: 'http://test.com/1' },
					{ image: 'banner-2.jpg', url: 'http://test.com/2' },
					{ image: 'banner-3.jpg', url: 'http://test.com/3' },
				];

        function getRandom(max) {
            var rand = Math.random();
            rand = Math.floor(rand * 1000000);
            rand = (rand % max);
            return rand;
        }

        function appendBanner() {
            var index = getRandom(3);
            currentBannerIndex = index;
            $('div.page').append('<div class="banner-ad"><a href="' + banners[index]['url'] + '" target="_blank"><img src="banner-images/' + banners[index]['image'] + '" alt="banner" /></a></div>');
            setTimeout(changeBanner, 5000);
        }

        function changeBanner() {
            currentBannerIndex++;

            if (currentBannerIndex >= banners.length) {
                currentBannerIndex = 0;
            }

            $('.banner-ad').fadeOut(function () {
                $('.banner-ad a').attr('href', banners[currentBannerIndex]['url']);
                $('.banner-ad img').attr('src', 'banner-images/' + banners[currentBannerIndex]['image']);
                $(this).fadeIn();
            });

            setTimeout(changeBanner, 5000);
        }