<div id="ajax-area">
  <g:remoteLink action="list" controller="file" update="ajax-area">
    view files
  </g:remoteLink>
</div>

<script type="text/javascript">
Ajax.Responders.register({
   onCreate: function() {
      if($('ajax-area'))
         $('ajax-area').update('<img src="${createLinkTo(dir:'images',file:'spinner.gif')}" border="0" alt="Loading..." title="Loading..." width="16" height="16" />');
   }
});
</script>

$(document).ready(function() {
    $("#ajax-area").bind("ajaxSend", function() {
        $(this).fadeIn();
    }).bind("ajaxComplete", function() {
        $(this).fadeOut();
    }
);