jQuery(document).ready(function($) {
    var upgrade_notice = '<a class="upgrade-pro" target="_blank" href="http://www.benignsource.com">Upgrade To BenignSource Shop Premium</a>';
    upgrade_notice += '<a class="upgrade-pro" target="_blank" href="http://www.benignsource.com/product-category/widgets/">BenignSource Premium Widgets</a>';
    jQuery('#customize-info .preview-notice').append(upgrade_notice);
});