Yes, if you want OJ to manage your main homepage (your index.html), basically you simply edit the index file in the ojtemplates subdirectory. That's where OJ is pulling out the file it uses to create itself.

This file can look and be like anything you want, as long as you:

<ul>[*]Leave the HTML comments in it that OJ is looking for (variables such as TOPPER)[*]Ensure the file can be writeable by the Web server software (easiest to simply rename your existing index.html file while testing and allow OJ to build its own from the template, once you're done editing the template file to your satisfaction).[/list]
Hope this is of some help!