Neil,
No worries about the help, it's what we do. I'll propose a solution here, and hopefully it will get you setup, if not.. we'll keep plugging away
What I'd recommend you do is install a module that allows you to insert custom PHP code into a module. We normally have good recommendations for this for Joomla 1.5, but for 1.6, the one below is what we found. It's free, has great reviews, and these types of modules really aren't overly complex, so it should do exactly what we're looking for. So.. get it, and install it:
extensions.joomla.org/extensions/edition...ode-in-modules/15251
Then, create a new instance of the module and put it in the position of the current Member Login module. In the custom code area, do the following:
<?php
$user = JFactory::getUser();
if ($user->guest)
{ ?>
Member Login
<?php
} ?>
Replace the Member Login line in that code with the full line you're using to load the RokBox. Basically, what that code will do is check if the user currently looking at the page is logged in or not. If not logged in, then show the Member Login link.
Then, create the JFBCLogin module, as described above, to show in the same module position and only show to registered users.
Hopefully this will work for you, but there could be a few tweaks required to get it going right if it's a little funky looking.
Good luck, and keep us posted. We'll get you there!