deactivating access logs of _all_ vhosts

[schipplock@tekonet]

Hi,
how can I deactivate the logging of all virtual hosts in plesk without entering every single domains configuration? (access log and error log)

We got several thousand virtual hosts and apache is writing too many files. We already deactivated stats generation because it's killing the machine for several hours.

Any help is appreciated!

Thanks,
Andreas.