i am almost finished with my installation

i just found out, that my absolut path for the menue-entry
"configuration/extras" is not well linked.. - means the images/css etc
are not found.. because its the wrong path..

actually correct would be in my case "/var/www/ox"
the ox looks for it in "/var/www" so in what file i can especially this
path setup correctly?

thank you very much for your help!