Easing

Easing

Hello I'm trying to use the easing plugin but I can't get it to alter the duration, where am I going wrong?
Thanks
  1. <script type="text/javascript">
  2. $(document).ready(function() 
  3.   {
  4.   jQuery.easing.def = 'easeOutBounce';
  5. $('#item1').animate({duration:3000});
  6.   });