Add Logout Button to Navbar

[MultiSync77F]

I am using a style from this website, and I love it but there is one problem, for some reason the developer didn't include any logout links on any pages.

So I wanted to just add one to my header "Log Out" that will show on every page. Problem is what do I use for the text?

When I look at a logout link the href is

http://www.community.domain.com/login.php?do=logout&logouthash=1260473826-191a5f067c098e7250adf6f3cb90daa4b8c2b491

I tried using

http://www.community.domain.com/login.php?do=logout

but it doesn't work. I guess I need that hash part on the end? How do I get that? I'm assuming it will change for every user. So what do I need my href link to look like in order to get my log out button to work?

Thanks!