Switch bootswatch templates via a bookmarklet

bootswatchlet.js

javascript: (function (w) {
    if (!w.jQuery) {
        alert('jQuery is required.');
        return;
    }
    if ($('#bootswatch').length) {
    	alert('Bookmaklet already loaded.');
    	return;
    }
    var $link = $('<link>', {
        rel: 'stylesheet',
        id: 'bootswatch'
    }).appendTo('head');
    var $select = $('<select>', {
        css: {
            top: 8,
            right: 8,
            position: 'fixed',
            zIndex: 999999
        },
        html: '<option value="null">Bootswatch</option>'
    }).appendTo('body');
    $select.on('change', function (e) {
        var value = $select.val();
        value && $link.attr('href', value);
    });
    $.ajax({
        url: '//api.bootswatch.com/3/'
    }).done(function (data, status, xhr) {
        data.themes.forEach(function (val, key) {
            $select.append('<option value="' + val.cssCdn + '">' + val.name + '</option>');
        });
    });
})(window);