How to link external css files in codeigniter 2.0

[eluser]haydenk[/eluser]
Curious...

Where is this CodeIgniter 2.0 first of all?

Second, can someone explain where or what the "extenal css" is? From my point of view you're only using internal, as in it's within your own domain, external would be if you loaded it from another server, in which case link_tag() would take care of it for you.