Visualization problem with some website javascript

Hi to everyone,

i note visualization problem with some website, it seems some javascript.

If i visit for example the website

www.filesonic.com

I don't tha image in the middle of the website and if i click on "login" no windows appear.

This is happen with different browser and for example if open the javascript debug with Safari under the section "console" i see this error:

Failed to load resource: the server responded with a status of 404 (Not Found)

jquery.history.js:194

ReferenceError: Can't find variable: jQuery

global.it.js:2

ReferenceError: Can't find variable: $

http://www.filesonic.it/:111

ReferenceError: Can't find variable: $

How can i solve it?

It is not just a problem of this website but also some other

Javascript update 1 is installed and it is activated in java preferences and also in browser preferences

Regards