show_promo_links = function()
{
    var links = YAHOO.util.Dom.getElementsByClassName('hdr_promo_link');
    
    var promo_limit = links.length;
    
    if (promo_limit == 0) return;
    
    if (typeof promo_count == 'undefined') promo_count = 1;

    for (var i=1; i <= promo_limit; i++) {

        if (i == promo_count) {
            document.getElementById('promo_link_'+i).style.display = 'block';
        }
        else {
            document.getElementById('promo_link_'+i).style.display = 'none';
        }
    }
    promo_count = promo_count+1;
    if (promo_count == promo_limit + 1)
        promo_count = 1;
    var t = setTimeout("show_promo_links("+promo_count+")",2000);
}