JQuery :: Lock Function / Unlock User Interface Interactions

In the following code
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery.uilock.js"></script>
<script>
/* All you have to do is to call
* a uiLock() function
*/
$(document).ready(function() {
$('#submit').click(function(){
// To lock user interface interactions
// Optional: put html on top of the lock section,
// like animated loading gif
$.uiLock('Click Here <a href="#" onclick="$.uiUnlock();">unlock</a>');
});
// To unlock user interface interactions
//$.uiUnlock();
});
</script>
Where and how would I put a Animated loading gif?