How can I change the logformat in Plesk v1.3.1 for the vhosts from:

LogFormat "%h %l %u %t \"%r\" \"%{Referer}i\" %>s %b

to

LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\""

??

Thanks for your help!

Regards,

Eilko