Adding login and register features?

I want login and register options like they use on

http://www.slashgear.com/

I’m able to make the login buttons myself but the furthest iv got is directing them to the standard wordpress and register pages and then getting redirected to the page you were on. However their system seams to take you to one of their own pages with a form setup.

Would this involve editing my wp-login.php and wp-register.php pages to use the same template/style as my website? If so could anyone point me in the direction of more information as I’m not clued up on making templates and just hoping to put some code in to use my current setup.

-Thanks