problem after php upgrade

Hello! There are a lot of messages on my screen, when I update my server from php version5.2 to php version 5.4.


Strict Standards: Non-static method JSite::getMenu() should not be called statically in /home/.../...
Strict Standards: Non-static method JSite::getMenu() should not be called statically in /home/.../...
Strict Standards: Only variables should be assigned by reference in /home/.../...
...
...
...

Any idea to fix the problem?

I need to have the 5.4 php version. So to return to 5.2 version it'not a solution

Please disable Strict Standard messages in your PHP configuration or ask your service provider to do it. Disabling this messages is recommended by Joomla! installer.