I cannot get jQuery UI working in my ASP.NET MVC4 application. I tried dialog and datepicker. Here is part of the code of my view.
Your code runs just fine in a fiddle: http://jsfiddle.net/m3QFL/
Check the console for errors and the path to your scripts. Chrome includes a console to help with js debugging or you can run FireFox and FireBug.
Either one will go a long way in helping you solve issues like this.
Also, hosted versions of jquery and jquery ui are available through jquery and jquery ui or Google. Here are yours:
jquery ui has links at the bottom of their homepage to their hosted versions.
BTW, the //
instead of http://
allows the script to pick up the http
prefix from the site. If you are on ssl it will pick up the https://
so you don't have secure and non-secure items on your page.