Pulling in JQuery and JQuery UI from Google CDN?

Pulling in JQuery and JQuery UI from Google CDN?

Total noob question here, but when I try to switch the JQuery and JQuery UI libraries from the references in the sample code under "Droppable" sample code, i.e. the following two lines:

  <script src="http://code.jquery.com/jquery-1.9.1.js"></script>
  <script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>

to move over to the Google CDN:
  <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.min.js"></script>  

the html page hangs for quite a while (1 minute?) and then when it does load, it's not draggable. Everything works when I make no changes to the demo code at all. I see the same behavior on IE 11 and Chrome v31. I did also try   jquery/1.9.1 on the Google CDN reference.

Also, it's curious to me that the code samples are using and old JQuery library - is there a reason for that?

Finally, I was wondering if the .css file:

is available on the Google CDN? I didn't see any thing stated on the Google page. 

I feel like I'm missing something obvious here, but thanks in advance for any help.

Kirk