Facebook Login in Joomla
The Facebook Login button is the heart of Facebook Connect. This button is what powers the single-sign on functionality of JFBConnect, and what makes registering on your site a simple task for your users. As with the rest of JFBConnect, we've given you the power to integrate this button in numerous, extremely simple ways to fit your site's design and function

SCLogin Module
This option will get single-sign on up and running on your site in minutes, by using the standard Joomla login module, with enhancements for Facebook Connect functionality. The SCLogin Module extends the normal Joomla Login module by adding the "Login With Facebook" button along with a few other customizations to make integration easier.
JFBCLogin Easy-Tag
If you already have your site customized how you want, don't worry about adding a new module! Simply use the login functionality you already have, and add the following tag to your existing template or login module:
{JFBCLogin}
Once added, JFBConnect will automatically replace that tag with the "Login With Facebook" button. No more messing with your template and finely crafted Joomla site to add the power of Facebook Connect.
Custom Login Button Image (or Button)
You have full control of the Facebook Login button. While Facebook recommends the standard blue Login With Facebook button, you're free to use any image, html button, or standard text link. All you need to do is add a bit of Javascript to let JFBConnect know to use that button for logging in, and you're good to go! For example, to use your own custom image, use the following code:
<a href="javascript:void(0)" onclick="jfbc.login.login_custom();"><img src="http://cdn.sourcecoast.com/linktoimage.jpg" /></a>