function add_adsense() {
    var sidebar = $('sidebar');
    if (sidebar == null) {
        sidebar = new Element('sidebar');
        $('content').insertBefore(sidebar);
    }
    if ($('main').hasClassName('nosidebar')) {
        $('main').removeClassName('nosidebar');
        sidebar.show();
    }
    var adsense_area = $('adsense_area');
    adsense_area.remove();
    sidebar.insert(adsense_area);
    adsense_area.show();
    
}

document.observe('dom:loaded', function() {
    add_adsense();
});