if (document.images)
{
    adImages = new Array("img/banners/banner_001.jpg", 
                         "img/banners/banner_002.jpg",
                         "img/banners/banner_003.jpg",
                         "img/banners/banner_004.jpg", 
                         "img/banners/banner_005.jpg");
    adURLs = new Array("");
    thisAd = 0;
}

function cycleAds()
{
    if (document.images)
    {
        if (document.adBanner.complete)
        {
            if (++thisAd == adImages.length)
                thisAd = 0;

            document.adBanner.src = adImages[thisAd];
        }
    }

    // change to next sponsor every 3 seconds
    setTimeout("cycleAds()", 3000);
}

function gotoAd()
{
    document.location.href = "http://" + adURLs[thisAd];
}