title: jQuery plugin to display "loading" while waiting for AJAX response
body: <p>I have written some jQuery ajax code where I am sending a request to the server when a drop down option is changed.  Based on this change, 4 or 5 text fields change their data and bunch of new images get loaded. Everything feels nifty.</p>
  
  <p>But I was wondering if there was a plugin provided by jQuery that would make the page dark...show 'loading' or spinner for a quick second until request comes back from the server?  I remember seeing one around but am not able to find it. </p>