<div id="elem">Click to load something</div>

<script>
    $('#elem').click(function() {
        var interval = $(this).pulse('loading');
        // load something via ajax
        // and when done call clearInterval(interval)
    });
    $('#elem').pulse('loading');
</script>

The above will replace the div text with "loading ..." and animate the
ellipses so they are pulsing as a load indicator.