Redirect Problems

[blm126]

I'm having problems with this function to redirect the user.

function redirect($url){
//This is a function to provide a safe and relible redirect
//send a 303 location header
    header('Location: '.LINKBASE.$url,true,303);
//die with a click redirect
    die('Sorry, you could not be redirected. Please <a href="'.LINKBASE.$url.'">click here</a>');
} 

define LINKBASE(this is done before the function is called)

define('LINKBASE','http://localhost/cms/'); 

it is used here

function checkAuth($level,$url='index.php'){
    if(!isset($_SESSION['yes'])){
        session_start();
        $_SESSION['yes'] = 'yes';
    }
    if(isset($_SESSION['auth']) && $_SESSION['auth'] <= $level){
        return true;
    }
    else if(isset($_SESSION['auth']) && $_SESSION['auth'] > $level){
        return false;
    }
    else{
        redirect($url);
    }
} 

Whenever I run it Firefox(haven't checked other browsers) issues an error saying

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

I'm sure I'm making some stupid mistake, but I would love to know what it is.

[alexjewell]

shouldn't the header be called right after the opening php tags?

[blm126]

shouldn't the header be called right after the opening php tags?

That's not the problem here unfortunately. I'm using output buffering