dieses plugin benötigt man, damit man animierte bg-colors machen kann mit animate() Usually you can use the .animate() method to manipulate arbitrary CSS properties, but for background colors you need to use the color plugin. Once you include this plugin, you can use something like others have indicated $('div').animate({background-color: #f00}) to change the color. As others have written, some of this can be done using the jQuery UI library as well. USAGE: $('#myElement').animate({backgroundColor: '#FF0000'}, 'slow'); $('#errorMsg').animate({"bgColor": "#ff0000"}, 500);