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I will check it for you.
I checked your backend. I saw, all button of Joomla that can't save, close ...
Please contact with a person who manages your hosting. Because Hosting doesn't allow read some file your site,
Thanks a lot! i solved it checking the folder with the files you sended me.....there was an .htaccess file in folder media/system/js that doesn't have to be there...maybe a hacking attemp..maybe somethng else....i renamed it and everything turned to work again!
Can i ask you what did you use to discover not working files? so that in the future i can solve this kind of problem by myself without boring you?