I came across a situation where I needed an Ajax style spinner but could not download any images. I extended concepts from the jMaki Revolver to make an image free spinner all in JavaScript.

  window.waiter.show({ speed: 1,
                       delay : 40,
                       targetId : 'body',
                       textColor : '#FFF',
                       background: 'green',
                       opacity : 85,
                       message : 'Please wait 2'});

Test on this page

For detailed documentation on all the properties and more examples see the Ajax Waiter.

If there are features or enhancements you would like to see let me know.