jQuery Plug-in Backstretch not working

jQuery Plug-in Backstretch not working

I am trying this jQuery plug-in called Backstretch for full screen image.
I've followed as instructed on their website but it's not working. Nothing
is displayed.
I've first tried with local copies but it didn't work so I found CDN link
but it didn't work either.
Having them inside head tag or just before the end of body didn't make
difference.
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script
src="//cdnjs.cloudflare.com/ajax/libs/jquery-backstretch/2.0.4/jquery.backstretch.min.js"></script>
<script>
$.backstretch("http://dl.dropbox.com/u/515046/www/garfield-interior.jpg");
</script>
Does anyone have experience with this plug-in and have anything to share?