Did you also upload the jquery-ui.js file that your yepnope references?
Thank you for your answer!! I thought that yepnope was supposed to create the link to the library and didn't look at the html to see if it was there.
So that was the problem, I just created the link and it works!
Thank you for your answer too! I was trying it on browser, but to make it work on iPad, I normally add: http://touchpunch.furf.com/