How to install Mediawiki with lighttpd on domain abc like http://abc.com/w?

Hi !
I want to install mediawiki on abc domain so that in web browser it comes up as http://abc.com/w. I tried a lot of codes from google howtos in the lighttpd abc.com.conf file but when i restart lighttpd it fails. Can someone plz tell how to install mediawiki with lighttpd? What line should i add to the abc.com.conf file in lighttpd so that i can see http://abc.com/w/index.php page in browser?

Thanks in advance.