WordPress MU

Hello,
how I can check if wpmu is installed and not WP?

I would like to use an if statement and handle wp and wpmu different.

This check should work in wpmu and wp.

Do a check against $wpmu_version.

http://trac.mu.wordpress.org/browser/trunk/wp-includes/version.php

Look towards the bottom of that file.

hello,
thank you for your reply, but it is not working. I did an echo to this variable and it is empty. WP MU is installed....

any other idea?

ok, it is filled - I forgot to use global.

thanks for the answer