My site got hacked?

[PokePets]

// HoF asked for this thread, so...

So, I get now the whole time connetion errors on my website;

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/u693722181/public_html/inc/functions.php on line 1691

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/u693722181/public_html/inc/functions.php on line 61

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/u693722181/public_html/inc/functions.php on line 65

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/u693722181/public_html/inc/functions.php on line 621

Warning: mysql_num_rows(): supplied argument is not a valid MySQL result resource in /home/u693722181/public_html/inc/functions.php on line 625

Warning: file_get_contents(templates//template.html) [function.file-get-contents]: failed to open stream: No such file or directory in /home/u693722181/public_html/inc/functions.php on line 1760

Etc.

I checked the database and it seem's that there arn't any tables inside... Anything got deleted? But the weird thing is... the size of the database is still 0.7 MB...

I checked the Mys conect file etc. and it's ok.

Help please?
It's also weird that this error appeard after I installed the new Mys version in another subfolder (/Beta) and I used another database for that.