Facebook Login in a Popup?

I actually don't see how to get a pop-up Login button on that page, but, generally, to do put it in a pop-up in Joomla, you need to find an extension that's meant to pop-up a Joomla module. RocketTheme's RokBox is something that's been used a bit for this purpose, and doesn't require a RocketTheme template to work.

Once installed, you can use it to pop-up the JFBCLogin module. You will need to make a minor change to JFBCLogin to work in pop-ups though, which you can read more about at the link below. Look at the 2nd and 3rd questions about custom images for the login button and working in a Javascript pop-up:
www.sourcecoast.com/jfbconnect/docs/common-support-questions

Hope that helps, but if not, let us know!

Yeah, in that file, find the lines below:
And replace with the lines in the Common Support Question for working in a popup.

You'll need to start your code off with a ?> to close the PHP block that the above code was originally in. When done, your code will look like:
It's getting higher on our list to overhaul the template file for the Login module as it's pretty ugly right now. Sorry about that.

Let us know if you need anything else or run into issues.
Alex