jquery - ajax loading image with delay? -

i have ajax implemented refresh content want add delay - know how can add in code have?

$.ajax({    url: "<?php echo site_url('apply/processpersonaldetails'); ?>",    type: 'post',    data: form_data,    success: function(msg) {        $('#content').empty().html('<img src="../images/ajaxloader.gif" />');        $('#content').html(msg);    } }); 

ah sorry, mean delay before new content has loaded, want show loading image before new content displayed...does make sense?

i don't quite understand mean delay in scenario use settimeout function schedule execution of callback @ later moment:

window.settimeout(function() {     alert('this executed 3 seconds later'); }, 3000);