First, create a subdirectory under 'cgi-bin'.  It can be named anything,
but for example purposes, I will call the sub-directory 'oldstats'.

Next, place a copy of your old log in that directory and name it 'custom_log'
In the script, there is a commented line that you can alter to have
it parse the previous day's log automatically.

IMPORTANT!! - - - - - -
The script will create files in your base html directory called
pre.html, pre-access.html, and premenu.html

If you have files in that directory with the same names, they
WILL BE OVERWRITTEN. DO NOT RUN SCRIPT IF YOU NEED THESE FILE NAMES

Also, make sure to set the permissions on the files to '755'

Once your log file and script are in the sub-directory, you can call
it by typing in:

http://www.[your-domain-name.extension]/cgi-bin/oldstats/prestats.cgi

You will automatically be showed the parsed log on the web.