var banners = new Array();

window.onload = function initBanners()
{
    var x = 0;
    while (document.getElementById("bannerBlock"+(x+1)) != null)
    {
        banners[x] = document.getElementById("bannerBlock"+(x+1));
        banners[x].style.display = "none";
        x = x + 1;
    }

    changeBanners();
}

function changeBanners() 
{
    var x;
    var mark;
    mark = 0;
    for (x=0; x < banners.length; x=x+1)
    {
        if (banners[x].style.display == "")
        {
            mark = (x + 1) % banners.length;
        }
        banners[x].style.display = "none";
    }

    banners[mark].style.display = "";
    var timeout = banners[mark].getAttribute("timeout") * 1000;
    setTimeout("changeBanners()", timeout);
}