Redirect if not logged in (external site)

[onespot]

Hey All,
So I am tasked with basically combining my companies Wiki Page, Forums, e-Learning (LMS), and eventually their e-Commerce site all into one single site. I was hoping to have single sign on but this seems near-impossible with the Wiki from what I have seen so I am looking at a simple redirect - any time you go to a Wiki page it will check to see if you are logged into the forums, if you aren't it will redirect you to the login page.

Now this did work - I found some code which now I can't find again and it would do this properly - but the problem is that whenever that code was in my Wiki site, the login of the Wiki no longer worked (I only need to login as admin to edit content - the users don't need to). So while this works somewhat - I am not sure why that redirect code is breaking the login of my Wiki site all together...

Basically :

1. go to site
2. check for login
3. if not logged in, redirect to login page
4. still allow me to login to my wiki page