Layout With Two Contents Part ? Possible ?

I created the main.php under layout, Then I created a separate index.php for my registration form. I want my landing page/site index page be like facebook, with a registration form and a login form on the top tool bar.

The problem I'm facing is, I don't know how to integrate the two in the same layout. I already used the $content
for the registration form, I need to know how I can create another variable that can be used for the login form ?

Please let me know if there is any way around it. I appreciate it.

Thanks
Alex