Accidentally changed permissions

[NIIcK]

Hello,

I've accidentally changed the permissions for /var/www/ispcp/gui/ folder and now i can't open the main login interface. I get a 403 error:

Code:

You don't have permission to access / on this server.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

What permissions should I set to this folder and for which user/group?

Please help!

Thank you,

Nick