how to show a loading image while using jquery autocomplete?

how to show a loading image while using jquery autocomplete?

Hi,
I wanted to show a loading image while using jquery autocomplete.
I am using the default jquery autocomplete and the link to this is
http://jsfiddle.net/YPBts/2/

and i wanted to show a loading image like this
test
Can any body tell me where to make changes.
I have a image loading.gif in the same folder with this file