function hideBlueBar(hash) {

    if (typeof jQuery != 'undefined') {
        $.ajax({
            url: '/api/promotions.php',
            data: { bluebar_hash: hash },
            type: 'post',
            success: function() {
                $('.bluebar_' + hash).hide();
            }
        });
    } else {
        YAHOO.util.Connect.asyncRequest('POST', '/api/promotions.php', { success: function() {
            YAHOO.util.Dom.getElementsByClassName('bluebar_' + hash).style.display = 'none';
        } }, '{"bluebar_hash":"'+hash+'"}');
    }

    return true;
}