Hi, if I understand you correctly you want to hide index.php while you are working on your website, so that know one can see it until it is ready...ok, easiest way to do it is to create an index.html webpage and upload it to your root (where your mambo files are) folder. I've got a redirection one, redirect any one that types in
www.yoursite.com to disney or wherever you choose. Send me an email if you want it.
Oh and change your renamed index.php back to what it was.
If that doesn't work contact me via msn or yahoo and I will help you.