Based on this link from Google Cache your site appears to be a Wordpress site.
I am unable to decipher any methods of attack, troubleshoot, or fix the hack from the outside since the site is not hosted with us, however.
You will want to contact the site host to see if they can help with any backup restoration. Once restored, you will want to always run the latest version of Wordpress when as they are released as they plug security holes as the program is updated. Also ensure all themes and plugins are updated as they are often methods of entrance for malicious hackers.
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