Alright, so a content page uses this:

$tab = "Friends";
$title = "User Profile"; 
include '(the header file, with nav)';

And the header page has the code:

if ($tab == "Friends") { 
echo '<li id="current">'; 
} else { 
echo '<li>'; 
}

The problem is, that the if $tab == Friends condition is never activated, and no other variables are carried from the the content page, to the header page.

Does anyone know what I'm doing wrong?

Update: Alright, the problem seemed to disappear when I used ../scripts/filename.php, and only occurred when I used a full URL?

Any ideas why?