wiki and web simunanly

hi folks

i think i have a simple problem.

i have configurate a lion server with the new update from oct. 2011.

wiki alone works fine, the webserver also. but when i try to run both simuntanly i have some problem's because they point both a the same url:

http://hostname.ch.

soon as I enable the webserver, my wiki runs anymore. The goal would be to have access to the wiki with the hostname.ch and other webs under different hostnames. Unfortunately, the hostname c'ant change for the standard Web;-(?!

any solution without edit httpd.conf?

thanks for awnser

best regards