function BannerClicked(result, ui_id)
{
    if (result.status == Http.Status.OK)
    {
        var url = result.responseText;
        if (url != null && url != undefined)
        {
            if (url.indexOf("http") > -1)
                window.open(url);
            else if (url.indexOf("javascript:", 0) > -1)
            {
                var scriptUrl = new String(url).substr(11);
                eval(scriptUrl);
            }
            else
                location.href = url;        
        }
    }
}
function ClickBanner(url, itemID, zone, bannerID)
{
    Http.get(
    {
    url: "/BannerTrack.aspx?URL=" + encodeURIComponent(url) + "&BannerID=" + bannerID + 
     "&ItemID=" + itemID + "&Zone=" + zone,
    callback: BannerClicked,
    cache: Http.Cache.GetNoCache
    },  [url]);
}