function switchBanner (iterator)
{
    var banner = document.getElementById('portal-banners');
    if (banner)
        {
            var slots  = banner.getElementsByTagName('div');
            for (var i=0; i<slots.length; i++)
                {   
                    var div = slots[i];
                    if (div.className == 'slot-box')
                        {
                            var divList = div.getElementsByTagName('div');
                            var banners = new Array();
                            for (var b=0; b<divList.length; b++)
                                {
                                    if (divList[b].className == 'banner-box')
                                        {
                                            banners.push(divList[b]);
                                        }
                                }
		    
                            if (banners.length > 1)
                                {			    
                                    var pos = iterator%banners.length;
                                    banners[pos].style.display = 'none';

                                    var pos = (iterator+1)%banners.length;
                                    banners[pos].style.display = 'block';
                                }
                        }
                }
        }
    iterator++;
    window.setTimeout('switchBanner('+iterator+')', 5000);
}