log4j Rolling + Date FileAppender

[PT]

Quick question for those of you with knowledge of log4j.

I would like combine the capabilities of the RollingFileAppender and
the DailyRollingFileAppender.
Basically, I want the log to roll over once a day but only keep the
last 7 days. The size of the log will differ significantly day to day
so using just the RollingFileAppender won't work.
Also, I do not want to modify the code if at all possible...I just
don't have time to deal with it.

Any ideas?

Thanks,
Preston