Custom logout function not working

[eluser]RyanH[/eluser]
That's pretty much all of the code. What I'm looking to do is simply log someone out, not even check to see if they're logged in, that shouldn't be that hard to do on each page. I guess I'm going about it the wrong way.

I'd actually like to use Erkanaauth but I haven't been able to get it to work so I'm trying to use my own. I don't need anything fancy, either.