A simpler, slightly more efficient, less customizable jQuery Spinner plugin.

jquery.spin.js

/*

You can create a spinner using either of the variants below:

$("#el").spin(true);  //Starts the spinner.
$("#el").spin(false); // Kills the spinner.

*/
(function($) {
  $.fn.spin = function(opts) {
    if (Spinner) {
      if (opts !== false) {
        return this.each(function() {
          var $this = $(this), data = $this.data();
          if (!data.spinner) {
            data.spinner = new Spinner();
          }
          data.spinner.spin(this)
        });
      } else {
        return this.each(function() {
          var $this = $(this), data = $this.data();
          if (data.spinner) {
            data.spinner.stop();
          }
        });
      }
    } else {
      throw("Spinner Class not Available!");
    }
  }
})(jQuery);